Peter said to him, "Lord, why cannot I follow you now? I will lay down my life for you." Jesus answered, "Will you lay down your life for me? Truly, truly, I say to you, the cock will not crow, till you have denied me three times.

John 13:37-38

No act of virtue can be great if it is not followed by advantage for others. So, no matter how much time you spend fasting, no matter how much you sleep on a hard floor and eat ashes and sigh continually, if you do no good to others, you do nothing great.

- St. John Chrysostom