Selfishness seeks its own private happiness at the expense of others.
Love seeks its happiness in the happiness of the beloved.
– John Piper

Self is the most treacherous enemy, and the most insinuating deceiver in the world.
Of all other vices, it is both the hardest to find out, and the hardest to cure. 
– Richard Baxter

Men have dreamed of finding the fairy pleasure in the dark forest of sin. 
Carnal joys have danced before their eyes as temptingly as the mirage in the desert,
and they have pursued the phantom forms to their misery in this world,
and to their eternal ruin in the next.
– Charles Spurgeon