A man could not, by his own might, fulfill the law of the word of God that is bestowed onto him. One of the purpose God gave man something they cannot prevail alone so that men would seek Him and build a relationship of fellowship.
Besides wisdom and grace, God also bestow men faith. Faith is unique, it gets us through places. Faith can’t really be explained for it gives evidence to things that are yet to come.
1 Corinthians 10:13 (NET) No trial has overtaken you that is not faced by others. And God is faithful: He will not let you be tried beyond what you are able to bear, but with the trial will also provide a way out so that you may be able to endure it.