Inward light, Light of God, Light of Christ, Christ within, That of God, Spirit of God within us, Light within, and inner light are related phrases commonly used within the Religious Society of Friends (Quakers) as metaphors for Christ's light shining on or in them. It was propagated by the founder of the Quaker movement, George Fox, who "preached faith in and reliance on 'inward light' ". The first Quakers were known to sit in silence and meditate on the words of the Bible until they felt the inward light of God shining upon them and the Holy Spirit speaking. The concept was highly important to early Quakers, who taught: "God reveals Himself within each individual's conscience and consciousness by the Holy Spirit, Christ Himself being the Light to illuminate man's sinfulness and lead in the way of truth and righteousness. ... this light is in all men by the grace of God to lead them to Christ, and that the same light will give daily guidance to the Christian."