To be weary is to be exhausted physically, and/or mentally. It is when you think and say things like, "I am sick of this." "I have had it with this." "I'm tired of this." It can also be the result of being, or feeling defeated. It happens to all us, over and over through life; as long as we are living we will feel weary often, because life is a struggle. God does not tell us not to be weary, but not to be weary in well-doing; that is, doing what is right. Rest is the cure for physical and mental weariness, while faith and patience are the cure for weariness in well-doing.