Galatians 6:3

For if anyone thinks himself to be something, when he is nothing, he deceives himself.

Surrounding context

6:2 Bear one another's burdens, and so fulfill the law of Christ.

6:3 For if anyone thinks himself to be something, when he is nothing, he deceives himself.

6:4 But let each one examine his own work, and then he will have rejoicing in himself alone, and not in another.

Translation and sources