Jesus is not calling you to live by faith. You’re already doing that. We all live by faith; we all trust someone or something to lead us to the life we ache for, whether our faith is in a politician or professor or scientist or subculture or ideology or just our own inner compass of desire. The question isn’t “Do you live by faith?” but “Who or what do you put your faith in?” Jesus is calling you to live by faith in him.