I think that those who serve most potently, work on levels of consciousness that have to do with radiating love — maybe God's love... It is important that you have a brain and use it, but that is secondary. The basic premise is that you allow something to come through you. Then you use your intelligence to give your heart's work discipline and logic. But the transformative energy, that which can change events, that heals, that helps, that serves, comes from somewhere deep inside.
Those who neglect silence bring only a distracted heart and a preoccupied mind to their prayer and, instead of deriving new strength from it, they only offer God a heart full of trifles. Intimate conversation with God is easily stifled if you do not first put an end to exterior chatter; yet, if you love silence and keep it well, your heart will be a temple where God will dwell and become known to you there.