I heard this line from a pandaren NPC (Ji Firepaw) in World of Warcraft:
"The greatest virtue is the will to act."
That made me think:
He's still got stuff to learn. There is no greatest virtue. Virtue itself is one concept. Its flavors and manifestations can be very complex. If you attempt to judge those complexities, you might get distracted from the spirit of virtue.
I guess he might be saying it's the greatest virtue because he needs to believe it so that he doesn't feel too bad about himself for not having the courage to tell Aysa Cloudsinger how much he likes her.