Grace is a very important part of the Christian life. Not only are we saved by grace (Ephesians 2:8), but grace should be a big part of living as a Christian after we are born again.
II Peter 3:18
But grow in grace, and in the knowledge of our Lord and Saviour Jesus Christ. To him be glory both now and forever. Amen.
II Timothy 2:1
Therefore, my dear child, be strong in the grace that is in Christ Jesus.
We are to grow in grace and be strong in grace. In II Corinthians 12, Paul talked about the harsh struggles he was going through, and how he talked to the Lord Jesus Christ about them.
II Corinthians 12:7-10
Furthermore, so that I would not be overly exalted by reason of the exceeding greatness of the revelations, there was given to me a thorn in the flesh, a messenger of Satan, to buffet me so that I would not be overly exalted. Concerning this, I besought the lord three times that it might depart from me, and he said to me, “MY GRACE IS ADEQUATE FOR YOU, for my power is perfectly accomplished in weakness.” Therefore, I will most gladly boast even more in my weaknesses so that the power of Christ may reside in me. Wherefore, I take pleasure in weaknesses, in abuses, in obligations, in persecutions, in calamities for Christ, because when I am weak, then I am powerful.
Jesus Christ told Paul that his grace was adequate for him, his grace was all he needed to be able to handle the hardships he was dealing with.