So would it be a mistake for me to say it is only by the grace of God that I have not cheated on my wife and disqualified myself for ministry? Or does God also keep me from that kind of sin, which I could possibly commit as an eternally secure Christian?
Or should I say, God's grace keeps me from abandoning the faith, but my own efforts keep me from commiting big sins? Does God not also keep me from those?
Look at Job, was it God that kept Job from cursing Him? Did Job make conciscious choices not to curse God in adversity.
Then Paul tells us there is a war within us as believers in:
Gal. 5:16 This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh.
17 For the flesh lusteth against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other: so that ye cannot do the things that ye would.
If you allow the Spirit to Control instead of your Old Nature which is in the flesh then you don't fall or fulfill the lust of the flesh.
Here is the Christian Way of Life:
Ephesians 5:18 And be not drunk with wine, wherein is excess; but be filled with the Spirit;
We are commanded to be filled with the Spirit, that means to allow Him to control our lives, when we do we will not practice sin, we will not excessively sin. Paul's point when a person is drunk with wine which is excess they are controlled by that wine, just like when we allow sin to control it is excess. When you are filled or controled by the Spirit you will do what God's plan is not what the flesh wants you to do.