I must say to myself that I ruined myself, and that nobody great or small can be ruined except by his own hand. I am quite ready to say so. ... Terrible as was what the world did to me, what I did to myself was far more terrible still.
Oscar Wilde, Russell Jackson, Ian Small (2000). “The Complete Works of Oscar Wilde: De profundis, "Epistola : in carcere et vinculis"”, p.162, Oxford University Press on Demand