" If God promises certain things to men upon certain conditions, then be strong in faith, knowing that God is right and anything to the contrary is wrong. It is only by faithfully taking God at His Word in all that He says, that faith will grow and become unwavering. When one achieves unwavering faith in what God says, he will receive unwavering answers to his prayers. But when man is double minded and changes his mind every few minutes about what he has asked of God, how can God decide whether the man really wants it or not? Under the circumstances God does not give it to him. When one doubts, he contradicts God's Word that promises him what he has prayed for, and such contradiction cuts him off from the answer. "
― , God's Plan for Man: Contained in Fifty-Two Lessons, One for Each Week of the Year