St. John of the Cross - Ascent of Mt. Carmel.
"
In order to arrive at pleasure in everything
Desire to have pleasure in nothing.
In order to arrive at possessing everything,
Desire to possess nothing.
In order to arrive at being everything
Desire to be nothing.
In order to arrive at knowing everything,
Desire to know nothing.
In order to arrive at that wherein thou hast no pleasure,
Thou must go by a way wherein thou hast no pleasure.
In order to arrive at that which thou knowest not
Thou must go by a way thou knowest not.
In order to arrive at that which thou possest not,
Thou must go by a way that thou possesst not.
In order to arrive at that which thou art not,
Thou must go through that which thou art not.
When thy mind dwells upon anything,
Thou art ceasing to cast thyself upon the All.
For in order to pass from the all to the All,
Thou hast to deny thyself wholly in all.
And when thou comest to possess it wholly,
Thou must possess it without desiring anything.
For, if thou wilt have anything in having all,
Thou hast not thy treasure purely in God."