How to Cultivate Virtues by Yourself?

The author says he's introverted and doesn't want to interact with other people in order to cultivate virtues. "I can barely depend on, you know, myself to do what I need to do to grow" Prayer, fasting, Bible study, meditation are some of the ways that we can cultivate virtue by ourselves. The best way to grow humility is hidden service because nobody sees what you do.