Concupiscence is an ardent longing, typically one that is sensual. In Christianity, particularly in Catholic and Lutheran theology, concupiscence is the tendency of humans to sin.
St. Augustine explored and used the term "concupiscence" to refer to sinful lust.
Augustine of Hippo, also known as Saint Augustine, was a theologian and philosopher of Berber origin and the bishop of Hippo Regius in Numidia, Roman North Africa. His writings influenced the development of Western philosophy and Western Christianity, and he is viewed as one of the most important Church Fathers of the Latin Church in the Patristic Period. His many important works include The City of God, On Christian Doctrine, and Confessions.
Saint Augustin by Philippe de Champaigne, c. 1645
Saint Augustine Taken to School by Saint Monica, by Niccolò di Pietro, 1413–15
The earliest known portrait of Augustine in a 6th-century fresco, Lateran, Rome
Saint Augustine and his mother, Saint Monica (1846) by Ary Scheffer