Proverbs 3:5-8 NIV
Trust in the Lord with all your heart and lean not on your own understanding; [6] in all your ways submit to him, and he will make your paths straight. [7] Do not be wise in your own eyes; fear the Lord and shun evil. [8] This will bring health to your body and nourishment to your bones.

Mark 9:21-24 NIV
Jesus asked the boy's father, “How long has he been like this?” “From childhood,” he answered. [22] “It has often thrown him into fire or water to kill him. But if you can do anything, take pity on us and help us.” [23] “ 'If you can'?” said Jesus. “Everything is possible for one who believes.” [24] Immediately the boy's father exclaimed, “I do believe; help me overcome my unbelief!”

Jude 1:22 NIV
Be merciful to those who doubt;