1) Know what happiness feels like, so you can recognise happiness when / if it happens.
2) Try different things to see if any of them elicit the response.
3) Try those things again on another day, because our stress levels vary and affect happiness.
4) Rinse and repeat.
5) If you find something that makes you feel happy, remind yourself it might change over time.
“No mockery in this world ever sounds to me so hollow as that of being told to cultivate happiness. What does such advice mean? Happiness is not a potato, to be planted in mould, and tilled with manure."
~ Charlotte Brontë, Villette (1854)
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And in the end, the love you take is equal to the love you make.