Not that we are sufficient of ourselves to think of anything as being from ourselves, but our sufficiency is from God,
2 Corinthians 3:5
Surrounding context
3:4 And we have such trust through Christ toward God.
3:5 Not that we are sufficient of ourselves to think of anything as being from ourselves, but our sufficiency is from God,
3:6 who also made us sufficient as ministers of the new covenant, not of the letter but of the Spirit; for the letter kills, but the Spirit gives life.