Fountain of Light: from that light flows the light that is essential for the very existence of life, and the light of understanding in which the point of life, its meaning, its purpose and direction, can, within our limited capacity, be grasped. Divine light, not artificial, not intermittent, seasonal, or subject to power cuts. But issuing from God as from a fountain ceaselessly playing, springing up endlessly and joyously, irradiating the uttermost parts of the universe, suffusing the darkest corners of the human heart.
~ from THE EMPIRE OF THE HEART by John F.X. Harriott
If the heart wanders or is distracted, bring it back to the point quite gently -- and even if you do nothing during the whole of your prayer but bring your heart back, though it went away every time you brought it back, your time would be very well employed.