'Nature' in the Bible

Beloved, I urge you as aliens and strangers [in this world] to abstain from the sensual urges [those dishonorable desires] that wage war against the soul.

Instead of that, it should be a new nature within--the imperishable ornament of a gentle and peaceful spirit, which is indeed precious in the sight of God.

Husbands, in the same way, live with your wives with an understanding of their weaker nature yet showing them honor as coheirs of the grace of life, so that your prayers will not be hindered.