Happiness is the great question confronting mankind. The whole world is longing for happiness and it is tragic to observe the ways in which people are seeking it. The vast majority, alas, are doing so in a way that is bound to produce misery. Anything, which by evading the difficulties, merely makes people happy for the time being, is ultimately going to add to their misery and problems. That is where the utter deceitfulness of sin comes in; it is always offering happiness, and it always lead to unhappiness and to final misery and wretchedness. The Sermon on the Mount (Matthew 5:1-12) says, however, that if you really want to be happy, here is the way. This and this alone is the type of person who is truly happy, who is really blessed. This is the sort of person who is to be congratulated.
-Dr. Martyn Lloyd-Jones, Studies in the Sermon on the Mount