Grace: Justification By, Opposed to That by Works
Source: TTT
Romans 4:4, 5
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.
Romans 11:6
And if it is by grace, then it is no longer by works. Otherwise, grace would no longer be grace.
Galatians 5:4
You who are trying to be justified by the law have been severed from Christ; you have fallen away from grace.