Guilt says "I need to change because who I am or what I'm doing isn't good enough." Love says "I want to change because I want to be happy and changing will help me to do that." I think that when people go on a journey of personal transformation, it often starts from a place of guilt. Guilt can be a great spring-board for that kind of thing, and even though it's pretty shaky, it truly can help motivate you to grow as a person, at least a bit. But at the end of the day, love is 10 times the transformative tool that guilt is, and it's a hell of a lot more pleasant to move forward without beating yourself up all the time.