1 Timothy 1:19

having faith and a good conscience, which some having rejected, concerning the faith have suffered shipwreck,

Mark 11:22-23

So Jesus answered and said to them, “Have faith in God. For assuredly, I say to you, whoever says to this mountain, ‘Be removed and be cast into the sea,’ and does not doubt in his heart, but believes that those things he says will be done, he will have whatever he says.