Fernando Pessoa said this quote

I have a very simple morality: not to do good or evil to anyone. Not to do evil, because it seems only fair that others enjoy the same right I demand for myself – not to be disturbed – and also because I think that the world doesn’t need more than the natural evils it already has. All of us in this world are living on board a ship that is sailing from one unknown port to another, and we should treat each other with a traveller’s cordiality. Not to do good, because I don’t know what good is, nor even if I do it when I think I do. How do I know what evils I generate if I give a beggar money? How do I know what evils I produce if I teach or instruct? Not knowing, I refrain. And besides, I think that to help or clarify is, in a certain way, to commit the evil of interfering in the lives of others. Kindness depends on a whim of our mood, and we have no right to make others the victims of our whims, however humane or kind-hearted they may be. Good deeds are impositions; that’s why I categorically abhor them.