“ Desire is the actual essence of man, in so far as it is conceived, as determined to a particular activity by some given modification of itself. ”
 Baruch Spinoza, Ethics (1677). copy citation

add
Author Baruch Spinoza
Source Ethics
Topic desire activity
Date 1677
Language English
Reference
Note Translated by R. H. M. Elwes
Weblink http://www.gutenberg.org/files/3800/3800-h/3800-h.htm

Context

“Lastly, the definitions of the emotions require to be supplemented in a few points; I will therefore repeat them, interpolating such observations as I think should here and there be added. DEFINITIONS OF THE EMOTIONS I. Desire is the actual essence of man, in so far as it is conceived, as determined to a particular activity by some given modification of itself. Explanation.—We have said above, in the note to Prop. ix. of this part, that desire is appetite, with consciousness thereof; further, that appetite is the essence of man, in so far as it is determined to act in a way tending to promote its own persistence.” source