What we as natural men dont comprehend is that by nature we are dead to God, in such a condition we are without any hope in and of ourselves, like these gentiles Eph 2:12
12 That at that time ye were without Christ, being aliens from the commonwealth of Israel, and strangers from the covenants of promise, having no hope, and without God in the world:
This means nothing can possibly done by man to change his plight, he can not do anything spiritually good towards salvation. Without spiritual life its a dead end. By nature we cant even think a spiritual thought 2 Cor 3:5
Not that we are sufficient of ourselves to think any thing as of ourselves; but our sufficiency is of God;
Jesus even told His disciples in regards to spiritual matters Jn 15:5
I am the vine, ye are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing.
So what about a person dead in sin ? How can they come to Christ, a spiritual act, by their own freewill in the flesh ? 14