Purity is the ability to ...

Purity is the ability to contemplate defilement.
 Simone Weil

Quotes from the same author

Liberty, taking the word in its concrete sense, consists in the ability to choose.
 Simone Weil
Every time that a man has, with a pure heart, called upon Osiris, Dionysus, Buddha, the Tao, etc., the Son of God has answered him by sending the Holy Spirit. And the Holy Spirit has acted upon his soul, not by inciting him to abandon his religious tradition, but by bestowing upon him light. It is, therefore, useless to send out missions to prevail upon the peoples of Asia, Africa or Oceania to enter the Church.
 Simone Weil
Meditation on the chance which led to the meeting of my mother and father is even more salutary than meditation on death.
 Simone Weil
Love consents to all and commands only those who consent. Love is abdication. God is abdication.
 Simone Weil
I can, therefore I am.
 Simone Weil