soul
Happiness dwells in the soul
Happiness resides not in possessions and not in gold; the feeling of happiness dwells in the soul.
~ Democritus
Inward power of the soul
To live happily is an inward power of the soul.
~ Marcus Aurelius
Lost my mind
I put my heart and my soul into my work, and have lost my mind in the process.
~ Vincent Van Gogh
Heart and soul
Putting your heart into something is a commitment, putting your soul into it is passion.
~ Linda Poindexter