Martyn Lloyd-Jones, writing on 1 John 4:9 & 10:
The more I study the New Testament and live the Christian life, the more convinced I am that our fundamental difficulty, our fundamental lack, is seeing the love of God. It is not so much our lack of knowledge that is defective but our vision of the love of God. Thus our greatest object and endeavour should be to know Him better, and thus we will love Him more fully. (pg. 430)
Quote taken from Life in Christ by Martyn Lloyd-Jones ©2002 by Bethan Lloyd-Jones and published by Crossway.