What is happiness
In the Gospels of Luke and Matthew there is a description of the sermon of the mountain.
Matthew teach to us the 8 beatitudes (Matthew 5:1-12) but in the Gospel of Luke (Luke 6:20-26) there is a difference: he teach us the "ventures": there are 4 beatitudes (Luke 6:20-23) and 4 misfortunes (Luke 6:24-26).
Remember that in the Gospel of Luke we have the teaching of the Parable of the Good Samaritan (Luke 10:29), this parable teaches us that we sin, like the Levite who passes by or we live righteously as the Samaritan, we all have to choose between good and evil, between the path of rectitude and the sin. That is why there are 4 blessings and 4 curses.
Luke speaks of "ventures" and with this begins the revelation of the mystery of the Kingdom of God. The beatitudes express to us the promises of the kingdom of God and base of all hope. In the misadventures there is a warning: the danger of wealth and the false happiness.
The misfortunes explain to us that there is a false happiness, an opinion of happiness and this happens because we follow the false good, the idolatry of money. Remember the triple division of man: body, soul and spirit; the beatitudes are referred to the spiritual man (the spirit prevails) instead the misfortunes to the natural man (the body prevails). We have to follow the dictates of the spirit or the flesh.
The apostle Paul teach about the triple division of man: "those who live according to the flesh have their minds set on what the flesh desires; but those who live in accordance with the spirit have their minds set on what the spirit desires. The mind governed by the flesh is death, but the mind governed by the spirit is life and peace. The mind governed by the flesh is hostile to God; it does not submit to God's law, nor can it do so" Romans 8:5-8.
Christ calls us to follow the good happiness, not the happiness of appearances.
The true good of man is the eternal life, or to say the true knowledge of God, not happiness. The gospel of Luke is the gospel of mercy but is fundamentally an ethical gospel, which calls us to a change: from the sin to the righteous life (spiritual gift of righteousness), the life in grace of God.