People become so used to being unhappy they are unaware of the needless misery they cause themselves. They imprison themselves by filling their minds with thoughts of resentment, hatred, envy, and desires. It is amazing how they tolerate living such a life. The only reason they do tolerate it is because they have become so used to living with such thoughts they fell it is the normal picture of life. They mistakenly think it is impossible for life to be any different.