Karl Marx is often quoted as noting that religion is the "Opium of the People", which is true to a degree. But if you read further into the quote you'll find he articulates a full and beautiful notion of what real happiness looks like.
Religious distress is at the same time the expression of real distress
and the protest against real distress. Religion is the sign of the
oppressed creature, the heart of a heartless world, just as it is the
spirit of a spiritless situation. It is the opium of the people.
The abolition of religion as the illusory happiness of the people is
required for their real happiness. The demand to give up the illusions
about its condition is the demand to give up a condition that needs
illusions. The criticism of religion is therefore in embryo the
criticism of the vale of woe, the halo of which is religion.
Criticism has plucked the imaginary flowers from the chain not so that
man will wear the chain without any fantasy or consolation but but so
that he will shake off the chain an cull the living flower.
Beautiful, eh? Definitely worth sharing.