Perhaps because our normal listing of them, like any classification system, obscures their deeper meaning for our lives.

Saint Martin of Tours, a 4th century saint who was drafted by the Roman military, is famous for using his sword to cut his military cape in half to give to a beggar in the cold of the northern French winter.  The virtues of Saint Martin are many, and one might say the episode with the beggar is evidence of great charity, or of compassion or kindness or mercy, or even of courage.