"Life is an Echo"...
I heard this on an episode of Grey's recently and my brain almost exploded. Surely I'm not the only one who can binge watch Grey's Anatomy and come away with more life lessons than I can count :)
Life is an echo... what you give... you get back.
There is an old Chinese proverb that expands this thought.... as well as scripture galore that basically says....
What you reap you sow...
or how about...