Labor of love
The phrase "labor of love" refers to a task or activity that is undertaken primarily because one enjoys it or has a strong passion for it, rather than because of any expectation of personal gain or reward. It implies that even though the work involved may be difficult or demanding, the joy and satisfaction derived from the undertaking make it worthwhile.
English is confusing! Why do people say "Pardon my French" when they are speaking English? Because of idioms!
An idiom is a phrase or expression that usually presents a figurative, non-literal meaning attached to the phrase. Does that sound fun? It can be!
Play Just Saying - the word game that makes learning idioms a good time on your mobile phone or tablet.