(Latin: con, with; cupio, desire)
Yearning for something, mostly for something evil or contrary to reason, the inclination of the lower appetites, the opposition of the flesh to the spirit, which, though not sinful, is often the occasion of sin.
This is the Catholic view.
The Lutheran and Protestant view generally, even the Anglican, is that concupiscence is of itself sinful, the very essence of orig- inalsin which even Baptism does not remit.
This is in accord with Luther's doctrine on the slavery of the will, human nature being so tainted, the will so enslaved by concupiscence as to be incapable of actions not similarly tainted.
It is fortunate not all know, or live strictly in accordance with, the principles to which they subscribe. Saint Paul knew and confessed the struggle between the "law in my members fighting against the law of my mind" (Romans 7) but he also knew that "the grace of Godby our Lord Jesus Christ" would deliver him from the body of death.
New Catholic Dictionary