Matthew Poole and continuators on James 1:6

6 But let him ask in faith , nothing wavering : For he that wavereth, is like a wave of the sea, driven with the wind, and tossed .

With Confidence of God's hearing, grounded on the Divine Attributes and Promises, Mark 11.24. and 1 Iohn 5.14.

Either not disputing God's Power or Promise; or rather, not doubting, not staggering through Vnbelief, Rom. 4.20. where the same Greek word is used: So Acts 10.20. nothing doubting; and Mark 11.23. where it is opposed to believing.

This notes either the Emptiness, and Unprofitableness of faithless Prayer, when Men's Minds are thus at uncertainties, tossed to and fro; the Confidence they sometimes seem to have, like Waves, falls down and fails, and their Prayers come to nothing: Or, the Disquiet, and Torment, Distrust works in the Minds of such Waverers, which are never setled, till Faith come and fix them, Isa. 57.20.