From the pen of Jonathan Edwards. Commenting on Romans 10:14, he says:

"So there can be no love without knowledge. It is not according to the nature of the human soul, to love an object which is entirely unknown. The heart cannot be set upon an object of which there is no idea in the understanding. The reasons which induce the soul to love, must first be understood, before they can have a reasonable influence on the heart" (The Sermons of Jonathan Edwards: A Reader, p. 32).

In other words, it's impossible to love something unknown. It also follows that the more you grow to know something or someone, the greater the potential for love. A question worth thinking about is: what will it take for your love for God to grow?