The most powerful 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 the prayer is. To the quiet mind all things are possible. What is a quiet mind? A quiet mind is one which nothing weighs on, nothing worries, which, free from ties and from all self-seeking, is wholly merged into the will of God and dead to its own.
Meister EckhartTo get at the core of God at his greatest, one must first get to the core of himself at his least, for no one can know God who has not first known himself. This core is a simple stillness, which is unmoved itself but by whose immobility all things are moved and all receive life.
Meister Eckhart