Invincible . . .
is everyone who would (and can) much rather suffer than commit the least sin. Such a person cannot be overcome by evil. When a person sins, it is always because he no longer wants to suffer or does not manage to suffer any longer. Then he gives in to temptation and sin is born. He falls instead of standing as an overcomer. Jas. 1:14-15.
Whenever a person is tempted, he has to make a crucial choice between two things: suffering and overcoming the evil, or avoiding suffering by giving in to his sinful lust and thus committing sin.
By always suffering in the flesh without feeding it once in a while, we cease from sin. 1 Pet. 4:1. In this way we can be dead to sin in reality, far from the boundaries that you can generally imagine.
However, you will never be finished with one sin or another by being unfaithful once in a while. Faithfulness weighs heavily on the scales.
When you always choose to suffer instead of to sin, how could you then possibly sin? Is that possible? Is it possible to do that? No! Definitely not!
Why does a person become angry, bitter, offended, and unrighteous? Why does he lie? Why does he fall in adultery? Why does he argue and become jealous? Why is there divorce and birth control? Why can they not manage to submit to others or bear each other, etc., etc.?
There is only one answer to all this: People do not want to suffer; they cannot bear to suffer.
But they do manage to sin!
Our high and heavenly calling is to be invincible! Glory to God!