Boston continues with encouraging us to suffer well. He here shows that hope can be in the midst of a trial:

II. A word in the general to the lifting up abiding those that humble themselves. There is a twofold lifting up.

1. A partial lifting up, competent to the humbled in time during this life, Psal. 30:1. “I will extol thee, O Lord, for thou hast lifted me up, and hast not made my foes to rejoice over me.” This is a lifting up in part, and but in part, not wholly; and such liftings up the humbled may expect while in this world, but no more. These give a breathing to the weary, a change of burdens, but do not set them at perfect ease. So Israel, in the wilderness, in midst of their many mourning times, had some singing ones, Exod. 15:1. Numb. 21:17.

There is relief which may come in this age, in this world. The relief is not to be free of all troubles. The Lord himself was designated:

Isaiah 53:3 (ESV) 

            ³           He was despised and rejected by men, 

a man of sorrows and acquainted with grief; 

                        and as one from whom men hide their faces 

he was despised, and we esteemed him not. 

If the Lord was afflicted, why should we believe ourselves immune from trouble? Consider the matter with careful introspection: Do you really believe that you should not suffer trouble? Do you think of trouble as something which afflicts “them”? When you do have a 

Job 5:6–7 (ESV) 

            ⁶           For affliction does not come from the dust, 

nor does trouble sprout from the ground, 

            ⁷           but man is born to trouble 

as the sparks fly upward. 

There are those who sell the offer of a “Best Life Now”—now, before God has remade all things:

2 Peter 3:10–13 (ESV) 

¹⁰ But the day of the Lord will come like a thief, and then the heavens will pass away with a roar, and the heavenly bodies will be burned up and dissolved, and the earth and the works that are done on it will be exposed. 

¹¹ Since all these things are thus to be dissolved, what sort of people ought you to be in lives of holiness and godliness, ¹² waiting for and hastening the coming of the day of God, because of which the heavens will be set on fire and dissolved, and the heavenly bodies will melt as they burn! ¹³ But according to his promise we are waiting for new heavens and a new earth in which righteousness dwells. 

John MacArthur has a pointed evaluation of our best life now:

Out of curiosity, I want to know what’s in the book and so I found this on page 5, “God wants this to be the best time of your life.” On another page it says, “Happy, successful, fulfilled individuals have learned how to live their best life now.” On another page it says, “As you put the principles found in these pages to work today, you will begin living your best life now.” And that is absolutely true, if you’re not a Christian. This is it. You better get the book, because your next life is going to be infinitely worse than this one. This is your best life now. In fact, it’s your only life because in the world to come, you will only exist in a perpetual state of dying with no hope, no satisfaction, no meaning, no joy and no future, and no relief from eternal suffering. That’s the worst life possible. And this is your best life, if your next life is in hell.

https://www.gty.org/library/sermons-library/80-334/your-best-life-now-or-later

The application is plain:

Is your hope set upon the present or upon the Lord making all things new?

Are you surprised that this life is bounded and flooded with troubles?

Do you confuse the present world for the world to come?

John Bunyan in Pilgrim’s Progress has a useful image. Two children Passion and Patience are given gifts. Passion tears his open immediately, but the gift is soon worn out. Patience waits and opens his later. Passion mocked Patience at first, but in the end Passion had nothing. The Interpreter explained the image as follows:

So he said, These two lads are figures; Passion of the men of this world, and Patience of the men of that which is to come; for, as here thou seest, passion will have all now, this year, that is to say, in this world; so are the men of this world: They must have all their good things now; they cannot stay till the next year, that is, until the next world, for their portion of good. That proverb, “A bird in the hand is worth two in the bush,” is of more authority with them than are all the divine testimonies of the good of the world to come. But as thou sawest that he had quickly lavished all away, and had presently left him nothing but rags, so will it be with all such men at the end of this world.

We may have rest in this life, but we have no promise it will be continual. Yet although we are crushed, we are not overcome. We are in our troubles, but not alone:

Yet I do persuade myself, ye know that the weightiest end of the cross of Christ that is laid upon you lieth upon your strong Saviour; for Isaiah saith, “In all your afflictions He is afflicted” (Isa. 63:9). O blessed Second who suffereth with you! and glad may your soul be even to walk in the fiery furnace with one like unto the Son of Man, who is also the Son of God. Courage! up your heart! When ye do tire, He will bear both you and your burden (Ps. 55:22). Yet a little while and ye shall see the salvation of God.

Samuel Rutherford and Andrew A. Bonar, Letters of Samuel Rutherford: With a Sketch of His Life and Biographical Notices of His Correspondents (Edinburgh; London: Oliphant, Anderson & Ferrier, 1891), 34.

The difficulty of this life is no reason to lose heart. The rest in this is a blessing to be enjoyed. But we must remember that no blessing in this age is permanent. 

John 16:33 (ESV) 

33 I have said these things to you, that in me you may have peace. In the world you will have tribulation. But take heart; I have overcome the world.”

Our hope is in the Lord who has overcome the world.

And let us not overestimate the burden we face:

Christ has a yoke for us to wear, so let us wear it seriously; but it is an easy yoke, so let us wear it hopefully. He has a burden for us to carry for him, so let us be in earnest in bearing it; but it is a light burden, so let us be full of joy at the very prospect of carrying it

C. H. Spurgeon, “Christ’s Yoke and Burden,” in The Metropolitan Tabernacle Pulpit Sermons, vol. 49 (London: Passmore & Alabaster, 1903), 241.

2. A total lifting up, competent to them at the end of time, at death, Luke 16:22.—“It came to pass that the beggar died, and was carried by the angels into Abraham’s bosom.”—Then the Lord deals with them no more by parcels and halves, but carries their relief to perfection, Heb. 12:23. Then he takes off all their burdens, eases them of all their weights, and lays no more on for ever. He then lifts them up to a height they were never at before, no not when at their highest. He sets them quite above all that is low, and therein fixes them, never to be brought down more. Now there is a due time for both these.

There is a full rest from our burdens.  We may set our hope upon that rest.  There will be end to our trouble. God will straighten the crook in the lot and there will be no further trouble.