In Science discernment and demonstration go hand in hand. He who perceives the truth and then forgets or makes no attempt to put it into practice, has not really discerned it. We prove in practical application that only which we understand. On page 238 of "The First Church of Christ, Scientist, and Miscellany" Mary Baker Eddy writes, "God is understandable, knowable, and applicable to every human need."
Longing for freedom from sickness, from sorrow, from the countless fears and limitations which beset them, mortals may turn to Christian Science willing to accept its benefits, without perceiving that its Principle and rule offer not merely the easing of human ills, but the discerning of spiritual existence.
The angel message came to Moses out of a burning bush, yet the bush was not consumed. Moses, the future great lawgiver, was not satisfied merely to listen and accept this message. He wanted to understand what it was that had interfered with the accepted mortal law of destructibility; why, though on fire, the bush was unconsumed. And so he turned aside. And because Moses turned aside, he entered into God's presence, he talked with Him. Thereafter for Moses, both discernment and demonstration began to be experienced.