Selfishness is mankind's fundamental defect. At the root of every problem is selfishness. Where there is jealousy and selfishness, there is also disorder and every kind of evil. Every selfish person is potentially your enemy. Giving is the opposite of acting selfishly.
Divine love is the opposite of selfishness.
Christianity is the only one that teaches you can be totally changed and become a person with a new nature. We are products of a corrupt culture that teaches selfishness. All sin is selfish. However, we are unable to do it by ourselves. We must allow Jesus Christ to change us inwardly.