"The grand essentials to happiness in this life are something to do, something to love, and something to hope for."
~George Washington Burnap, [
The sphere and duties of woman : a course of lectures]
I translated this into geometric form - "The Triangle of Happiness"
This one approximates philipma1957's triangle.

The idea of a right-angled “triangle of happiness” is great. It seems to imply that our lives also move forward with three corners: work, love, and hope. These are three important like directions, wherever we turn our eyes, their imprint is there.
If we look at history then we can see that whether it is a great creation or a difficult struggle these three corners of the triangle have worked in the background of our life. Love does not run straight like a curved line of geometry, sometimes high, sometimes low; yet within it lies the continuous beauty of illusion.
Life is also full of ups/downs. We learn to maintain balance as we walk the curved path of rules and regulations. When viewed from a distance, the “triangle of happiness” seems like an engraving on the wall of an ancient temple that has survived time, and is silently teaching: many things are beautifully maintained in the triangular shape.
Finally, this is not just a philosophy point, it is a map of the human heart. Each line tells a story of emotion and the three angles together show what you do in life, who you love, and what you hope for. The path becomes clear.
