Just as a man is free to attempt to survive by any random means, as a parasite, a moocher or a looter, but not free to succeed at it beyond the range of the moment - so he is free to seek his happiness in any irrational fraud, any whim, any delusion, any mindless escape from reality, but not free to succeed at it beyond the range of the moment not to escape the consequences. In western civilization, the period ruled by mysticism is known as the 'Dark Ages' and the 'Middle Ages'. I will assume that you know the nature of that period and the state of human existence in those ages. The Renaissance broke the rules of the mystics. Few people today will care to remind you that it was a rebirth of reason - of man's mind.
Happiness is that state of consciousness which proceeds from the achievement of one's values.