labour of love

labour of love
a piece of hard work which you do because you enjoy it and not because you will receive money or praise for it, or because you need to do it:
He's always working on his car - it's a labour of love.

LOVE'S LABOUR'S LOST

LOVE'S LABOUR'S LOST by William Shakespeare

(愛的徒勞)；. Love's Labour's Lost. 莎士比亞喜劇【空愛一場】。1594或1595年首演。諷刺當時裝腔作勢的社會風氣。