1 Thessalonians 3:10

night and day praying exceedingly that we may see your face, and may perfect that which is lacking in your faith? ["Night," says Joseph de Maistre, "is a great chapter in the Psalms, to which David often recurs." Paul, like David, employed much of the night in meditation and prayer. At such times he remembered the brevity and sudden termination of his ministry in Thessalonica, and realized that his converts were not fully instructed in many items of faith and doctrine; he therefore prayed that he might return and complete his instruction. After three or four years his prayer was answered (Acts 20:1-2), and some ten years after that it was again answered-- 1 Timothy 1:3]