Stumbling upon these wise words scrawled on a wall reminded me of Simon and Garfunkle's Sound of Silence-- "The words of the prophets are written on the subway walls and tenement halls..."
In this case it was actually the wall of a public washroom, but I thought the spirit held true.
Fun fact: back in the day I had a Facebook album called "graffiti pandas and words of wisdom" dedicated to-- you guessed it-- street art/graffiti involving pandas (my favourite animal), and scribbled down words that I stumbled upon and wanted to remember/share.