"Learning to draw water up from the spiritual well is a hard labor, indeed -- at least in the beginning.
It is difficult, in the first place, to keep all of your senses recollected and focused upon total humility before God. What a tremendous difficulty that is, because our senses are so much in the habit of flitting about from one worldly distraction to another. And so you must learn to set aside what you see and hear in order to see and hear what God would pour out upon you from His invisible kingdom...
When we begin to renew our minds in this way -- that is, building the habit of constantly, deeply meditating upon the Lord Jesus -- we draw water up out of the deep wells of salvation (Isaiah 12:3)."
(The Life of Theresa of Jesus)