Does the Impossible Cause Your Faith to Waiver?

His trust did not waver when he considered his own body - which was as good as dead, since he was about a hundred years old - or when he considered that Sarah's womb was dead too. He did not by lack of trust decide against God's promises. On the contrary, by trust he was given power as he gave glory to God, for he was fully convinced that what God had promised he could also accomplish. Romans 4:19-21 CJB