If we plant a flower or a shrub and water it daily it will grow so tall that in time we shall need a spade and a hoe to uproot it. It is just so, I think, when we commit a fault, however small, each day, and do not cure ourselves of it.
Book called Way of perfection. Interior castle. Conceptions of the love of God. Exclamations of the soul to God (ed. 1946)