not that we are sufficient of ourselves, to account anything as from ourselves; but our sufficiency is from God;

Not that we are competent in ourselves to claim that anything comes from us, but our competence comes from God.

not that we are sufficient of ourselves to think anything, as of ourselves, but our sufficiency is of God,

not that we are competent of ourselves to think anything as of ourselves, but our competency [is] ofGod;