When boring is done to draw water from the bowels of the earth, the pipe has to be kept free of air so that the water will rise up. If the air enters, the water will not rise. So too, be sure that attachment to worldly things doesn't mar your Spiritual effort. Love will not rise up if sensual pleasure or personal pride invade the mind.
- Sathya Sai Speaks, Vol. 3, pg. 127.