Magnanimity is the good habit of a man who imagines, is inspired, and motivated to pursue great things which are extraordinary in their ability to serve God and others and are difficult to achieve, greatness which appears to be large on human scale (building a great charity or cathedral) or can appear to be relatively minor but have great impact (heroically passing on the faith to children). The truly Magnanimous man does great things for the glory of God and His Holy Catholic Church and with unselfish service to others.

Opposing Magnanimity are several vices: the vice of Presumption by which a man foolishly aspires to wild dreams beyond his capacity. The vice of Sinful Ambition which seeks to do great things for selfish riches and honors, and, vice of Vainglory, the desire for praise for unworthy things and/or unworthy people.