Act in such a way that you treat humanity, whether in your own person or in the person of any other, never merely as a means to an end, but always at the same time as an end.
All true religion, all true morality, all true mysticism have but one object, and that is to act on humanity, collective and individual, in such a manner that it shall correspond efficiently with the great law of development, and co-operate consciously therewith to achieve the end of development.
There was something alike terrifying and piteous in the spectacle of these frail old morsels of humanity consecrating their last flickering energies to the task of making each other wretched. Hatred seemed to be the one faculty which had survived in undiminished vigor where all else was dropping into ordered and symmetrical decay.
But we are living in a sceptical and, if I may use the phrase, a thought-tormented age: and sometimes I fear that this new generation, educated or hyper-educated as it is, will lack those qualities of humanity, of hospitality, of kindly humour which belonged to an older day.
All of us living in today's world are facing an enormous crisis - arguably the greatest that humanity has ever faced - in the form of man-made global warming; one can't be neutral at such a moment. It's like claiming to be neutral if you're living in Germany in 1933.