James 1:6-7
(GNB) 6 But when you pray, you must believe and not doubt at all. Whoever doubts is like a wave in the sea that is driven and blown about by the wind.
7 If you are like that, unable to make up your mind and undecided in all you do, you must not think that you will receive anything from the Lord.
NKJ: he is a double-minded man, unstable in all his ways.