Pierre Teilhard de Chardin

 Sons and daughters of the earth, steep yourself in the sea of matter, bathe in its fiery waters, for it is the source of your life and your youthfulness.

You thought you could do without it because the power of thought has been kindled in you? You hoped that the more thoroughly you rejected the tangible, the closer you would be to spirit: that you would be more divine if you lived in the world of pure thought, or at least more angelic if you fled the corporeal? Well, you were like to have perished of hunger.

You must have oil for your limbs, blood for your veins, water for your soul, the world of reality for your intellect: do you not see that the very law of your own nature makes these a necessity for you?