Fasting

Wisdom people say that it is not good to fast unless you first have had a good experience of God as Love.  Why?  Well, you might end up fasting as a form of pride.  "See how much better I am than you who do nothing but live your lazy life," a person might say.  You could get cranky when hungry, and judgmental of others who are eating chocolate ice cream or whatever you "gave up".  But if you are doing it as a response to Love, then it will make more sense or at least you won't be so "difficult" around others.