Jesus said that no man can serve two masters. Thus, servants of Christ must never serve other things. It might have been kin, or boss, sexual drives, lust for wealth, liquor, cigarettes, or drugs. Everybody has a master of some kind. It is better to be slave to the master of the universe than to our own selfishness, indulgences, and bad habits.
Mankind can stand great pain, suffering and privation.
Mankind cannot stand life without meaning or without purpose. Materialism and other modern concepts confuse young people. Many don't know what they should believe, and their lives have become without purpose or meaning. This is one reason why suicide among our young, ages 15 through 23, are the greatest cause of death, second only to accidents. To be free we must choose our activities to include only those that serve Jesus and His kingdom.