Happiness...

Happiness lies in thinking or doing that which one considers
beautiful.

Bowl of Saki, by Hazrat Inayat Khan

Commentary by Pir-o-Murshid Inayat Khan:

What is really good? The answer is, there is no such thing as good or
evil. There is beauty. That which is beautiful, we call good. That
which is ugly compared with the beautiful, we call evil: whether it
is custom, idea, thought or action. This shows that this whole
phenomenon of the universe is the phenomenon of beauty. Every soul
has an inclination to admire beauty, to seek for beauty, to love
beauty, and to develop beauty. Even God loves beauty.

In all ages the various religions have given different standards of
good and evil, calling them virtue and sin. The virtue of one nation
has been the sin of another. The virtue of the latter is the sin of
the former. Travel as we may through the world, or read the histories
and traditions of nations as we may, we shall still find that what
one calls evil, another calls good. That is why no one can succeed in
making a universal standard for good and evil. The discrimination
between good and evil is in man's soul. Every man can judge that for
himself, because in every man is the sense of admiration of beauty.
But he is not satisfied with what he does himself, he feels a
discomfort, a disgust with his own efforts. There are many people who
continue some weakness or some mistake, or who are intoxicated by
some action which the world calls evil or which they themselves call
evil, yet go on doing it. But a day comes when they also are
disgusted. Then they wish for suicide. There is no more happiness for
them. Happiness only lies in thinking or doing that which one
considers beautiful. Such an act becomes a virtue or goodness. That
goodness is beauty.

Man is always seeking for beauty, and yet he is unaware of the
treasure of beauty that is hidden in his own heart. He strives after
it throughout his whole life. It is as if he was in pursuit of the
horizon: the further he proceeds, the further the horizon seems to
have moved away. For there are two aims: the one is real, and the
other false. That which is false is momentary, transitory, and
unreliable - wealth, power, fame, and position are all snatched from
one hand by the other. ... Man wants something in life upon which he
can rely; and this shows, whether he believes in a deity or not, that
he is constantly seeking for God. He seeks for Him not knowing that
he is seeking for God. Nevertheless, every soul is pursuing some
reality, something to hold on to; trying to grasp something which
will prove dependable, a beauty that cannot change and that one can
always look upon as one's own, a beauty that one feels will last
forever. And where can one find it? Within one's own heart. And it is
the art of finding that beauty, of developing, improving, and
spreading that beauty through life, allowing it to manifest before
the inner and outer view, which one calls the art of the mystic.