Passion is a strong emotion and the enthusiasm to do something.

Enthusiasm signifies God in us. — Madame de Stael

Life is enthusiasm  zest. — Sir Laurence Olivier

There is only one big thing-desire. And before it  when it is big  all is little. — Willa Cather

There is nothing greater than enthusiasm. — Henry Moore

Enthusiasm is the most beautiful word on earth. — Christian Morgenstern

Boredom is the fear of self. — Comtesse Diane

It is not opposition but indifference which separates men. — Mary Parker Follett

Exuberance is beauty. — William Blake

Enthusiasm moves the world. — Arthur James Balfour

A man can be short and dumpy and getting bald but if he has fire  women will like him. — Mae West

What a man knows only through feeling can be explained only through enthusiasm. — Joseph Joubert

My enthusiasms ... constitute my reserves  my unexploited resources  perhaps my future. — E. M. Cioran