Aristotle said this quote

To perceive is to suffer.

~ Aristotle

One swallow does not make a summer,neither does one fine day; similarly one day or brief time of happiness does not make a person entirely happy.

~ Aristotle

For the things we have to learn before we can do them, we learn by doing them.

~ Aristotle

...happiness does not consist in amusement. In fact, it would be strange if our end were amusement, and if we were to labor and suffer hardships all our life long merely to amuse ourselves.... The happy life is regarded as a life in conformity with virtue. It is a life which involves effort and is not spent in amusement....

~ Aristotle