From, The Great Gain of Godliness
[D]ivine fear  is the reverencing and adoring of God’s holiness, and the setting of ourselves always under his sacred inspection. The infinite distance between God and man causes this fear. …God is so great that the Christian is afraid of displeasing him, and so good that he is afraid of losing him.
It is an indespensible duty incumbent on Christians to be fearers of God.
He then gives five elements of a godly fear. A right fear of God is “mixed with” love, faith, prudence, hope and industry [“A Christian fears and prays, fears and repents. Fear quickens industry….Fear banishes sloth out of its diocese.”].