2 Corinthians 3:2-5, Ye are our epistle written in our hearts, known and read of all men: Forasmuch as ye are manifestly declared to be the epistle of Christ ministered by us, written not with ink, but with the Spirit of the living God; not in tables of stone, but in fleshy tables of the heart. And such trust have we through Christ to God-ward: Not that we are sufficient of ourselves to think any thing as of ourselves; but our sufficiency is of God . . . 

This, “Ye are our epistle written in our hearts, known and read of all men: . . . our sufficiency is of God,”  is an example of incarnational thinking: to be evangelical one must be incarnationally minded.