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Thomas Aquinas Quotes about Sin

Unbelief is the greatest of sins.

Unbelief is the greatest of sins.

Thomas Aquinas (2013). “Summa Theologica (All Complete & Unabridged 3 Parts + Supplement & Appendix + interactive links and annotations)”, p.2852, e-artnow

Venial sin becomes mortal sin when one approves it as an end. . .

Thomas Aquinas (2003). “On Evil”, p.273, Oxford University Press

Sin is a spiritual illness; thus sinners are in need of salvation.

Saint Thomas (Aquinas) (2010). “The Academic Sermons (The Fathers of the Church, Mediaeval Continuation, Volume 11)”, p.47, CUA Press

It must be said that charity can, in no way, exist along with mortal sin.

"Quaestiones disputatae: De caritate (Disputed Questions: On Charity)". Book by Thomas Aquinas, circa 1270.

It is a sin directly against one's neighbour, since one man cannot over-abound in external riches, without another man lacking them.

St Thomas Aquinas (2013). “Summa Theologica, Volume 3 (Part II, Second Section)”, p.1680, Cosimo, Inc.