I have given you this advice because you, who hold a relationship with me, have become my limbs. Act upon my words and make use of reason and the Word of Allah so that the light of true insight and certainty develops within you, and so that you may become a path that leads others from darkness into light. For in this era, various allegations are raised on the basis of natural science, medicine and astronomy; it is necessary, therefore, to acquire a knowledge of the scope and background of these sciences so that we are able to understand such allegations before responding.
(Hazrat Mirza Ghulam Ahmadas, Malfuzat, Vol. 1, p 66)
