Boast only in Christ

Do not boast, as if everything we have was because our good works. Boast only in Christ, since we know outside Christ we cannot do anything, I'm not saying we cannot do 'good works' outside Christ, because we can find a lot of 'good people' outside Christ. But before God, even our 'good works' and our righteous deeds are like a polluted garment.

We shouldn't boast apart from Grace through Christ. Why sometimes I still boast for something that I've done in my life, it is because I see them more valuable and more reasonable than Christ's work on the cross. Because I think, when I did that, I become more valuable, if I didn't do that I become less valuable.