The Reward of Saints is of Grace, Through Faith Alone
Source: TTT
Romans 4:4, 5, 16
Now the wages of the worker are not credited as a gift, but as an obligation. / However, to the one who does not work, but believes in Him who justifies the wicked, his faith is credited as righteousness. / Therefore, the promise comes by faith, so that it may rest on grace and may be guaranteed to all Abraham’s offspring—not only to those who are of the law, but also to those who are of the faith of Abraham. He is the father of us all.
Romans 11:6
And if it is by grace, then it is no longer by works. Otherwise, grace would no longer be grace.