23 For we labor diligently to write, to persuade our children, and also our brethren, to believe in Christ, and to be reconciled to God; for we know that it is by grace that we are saved, after all we can do.
Believe in Christ and keep God's commandments (be reconciled to Him). I believe that the phrase "after all we can do" could also be read "in spite of all we can do." No matter how faithfully we keep His commandments, we cannot earn eternal glory with Father in Heaven through obedience or our own works. If we love Him, we will keep His commandments. Nevertheless, we are human and will commit sin. If we believe and trust in Christ, His atoning sacrifice covers those sins and He becomes the great mediator and redeemer to satisfy the demands of justice through His infinite mercy. For someone with the faults that I know I have, this promise is sweet.