We must begin by getting out of the unhealthy environment of selfish preoccupations. There are people who live sad and tormented by memories of the past, by what others think of them in the resent, and by what happen to them in the future. Let them forget about themselves and worry about others, about doing them some good, about serving them, and the gray ghosts will disappear. Happiness does not depend on the outside, but on the inside."  St. Augustine

When a person is in the will of God, trying to live the way that is pleasing to the Lord, then he can experience peace and happiness. This is not what the Evil One wants for us. To distract us from our real purpose, he places stumbling blocks in our path. These are the temptations that are self-centered. Each fall is a victory for him. But thanks be to God, while the temptations are from the Father of lies, God gives us sufficient grace and strength to lift our eyes to the needs of others instead. To the extent of our love and service of others, to that extent we can begin to experience what real happiness. This is what being selfless is.