Promising To Do Things
Be careful not to promise people you will do something, if you will not be able to do it right away. While we have an obligation to do kindness for others, learn to say "no" to requests you do not really intend to carry out. While you might save yourself a small amount of uneasiness by not refusing right away, it is unfair both to the other person and eventually to yourself to mislead someone
Love Rabbi Yehuda Lave.