Blessed are the pure in heart, for they shall see God

Jesus begins his preaching with the sermon of the mountain (Luke 6:20-23; Matthew 5:3-12), Jesus never speaks to us to seek happiness. All the beatitudes begin with the word "rejoice", "blessed", "happy". Virtue responds to the natural desire for happiness, which is the desire of the soul, because we have a soul we want to be naturally happy.

In the beatitudes the concept of happiness is different, the beatitudes respond to the desire for the good.

If we see the teachings of Jesus, happiness lies in eternal life, happiness is a promise related with the fear of God (the spiritual gift of fear of the lord is define as constancy, firmness, devotion, ecuanimity, stability). Remember the text: "Happiness is for those who fear God" Ecclesiastes 8:12.
Happiness is the result of the contemplative activity, of the maturity of man, the happiness as a goal of life is a false good
http://www.quintoevangelio.com.ar/en/articles/item/59-the-good-happiness.html