2 Corinthians 3:5 in the King James Version
Not that we are sufficient of ourselves to think any thing as of ourselves; but our sufficiency is of God;
Context
4 Such confidence we have through Christ toward God,
5 not that we are sufficient of ourselves to account anything as from ourselves; but our sufficiency is from God,
6 who also made us sufficient as servants of a new covenant, not of the letter but of the Spirit. For the letter kills, but the Spirit gives life.