And now it was Peter's mission to strengthen the other 10. Jesus provided for the 10 by providing for Peter. The strengthened becomes the strengthener. There is a great lesson here for us. Sometimes God will deal with you directly, strengthening your faith alone in the wee hours of the morning.
Eternal security is a community project.
Whenever God encourages your heart with the promise that in Satan's sifting your faith will not fail, then take that encouragement and double your joy by using it to strengthen your brothers and sisters.