Seems to be derived from Goethe's The Sorrows Of Young Werther.
> "Human nature," I continued, "has its limits. It is able to endure a certain degree of joy, sorrow, and pain, but becomes annihilated as soon as this measure is exceeded. The question, therefore, is, not whether a man is strong or weak, but whether he is able to endure the measure of his sufferings. The suffering may be moral or physical; and in my opinion it is just as absurd to call a man a coward who destroys himself, as to call a man a coward who dies of a malignant fever."
> Every day I observe more and more the folly of judging of others by ourselves; and I have so much trouble with myself, and my own heart is in such constant agitation, that I am well content to let others pursue their own course, if they only allow me the same privilege.
> What provokes me most is the unhappy extent to which distinctions of rank are carried. I know perfectly well how necessary are inequalities of condition, and I am sensible of the advantages I myself derive therefrom; but I would not have these institutions prove a barrier to the small chance of happiness which I may enjoy on this earth.
The meme checks out.