On the contrary, Happiness is the greatest good: since it is the end of man's life. But Happiness is not without pleasure: for it is written (Ps.
 Thomas Aquinas, Summa Theologica (1274). copy citation

add
Author Thomas Aquinas
Source Summa Theologica
Topic happiness writing
Date 1274
Language English
Reference
Note Translated by Fathers of the English Dominican Province
Weblink http://www.gutenberg.org/cache/epub/17897/pg17897-images.html

Context

“3: Further, that which is the greatest good is universally good, as being good of itself: since that which is such of itself is prior to and greater than that which is such accidentally. But pleasure is not universally good, as stated above (A. 2). Therefore pleasure is not the greatest good.
On the contrary, Happiness is the greatest good: since it is the end of man's life. But Happiness is not without pleasure: for it is written (Ps. 15:11) : "Thou shalt fill me with joy with Thy countenance; at Thy right hand are delights even to the end."
I answer that, Plato held neither with the Stoics, who asserted that all pleasures are evil, nor with the Epicureans, who maintained that all pleasures are good; but he said that some are good, and some evil; yet, so that no pleasure be the sovereign or greatest good.” source