The fitness of our hearts and thoughts to receive God's spirit is like that of violin strings. If they are properly tuned, in harmony with one another, then the touch of the bow produces beautiful music. If not, then there is only discord. Whenever our hearts are truly ready to receive God's spirit, they will produce heavenly airs and joyous harmonies -- both in this life and in the spiritual world.
On Thee the Angels look and are at peace; that is why they have perfect bliss. They never can lose their blessedness, for they never can lose Thee. They have no anxiety, no misgivings -- because they love the Creator.
~ from MEDITATIONS AND DEVOTIONS by John Henry Newman