The most perfect prayer, one well nigh omnipotent, and the worthiest work of all is the outcome of a quiet mind. The quieter it is, the more powerful, the worthier, the deeper, the more telling and more perfect prayer. The quiet mind is one which nothing weighs on, nothing worries, which is free from ties and all self-seeking, is wholly merged into the will of God and dead to its own.
–Meister Eckhart (1260-1328)