Life's happiness is in caring for yourself and living to make others happy.It is the flowing water that always is clean.
The sun gives its light daily and yet shines brighter.
The moon too, many times, yet, goes no dimer.
NOTE: if you want to be unhappy and sad, a good recipe is a fight, quarrel, and the neglect of those you can make happy. This happiness can be offered by simple kind words, respectful gestures, intentional help even in duties such as house chores, any task, and so on.
Just be kind, nice, respectful, polite, grateful, and simple to others. It makes the difference for you as much for them.
Peace!