Ephesians 3:18

"To the end that ye being rooted and grounded in love, may be strong to apprehend with all the saints, what is the breadth, and length, and height, and depth," Thus is his prayer now again, the very same as when he began. For what were his words in the beginning? "That the God of our Lord Jesus Christ, the Father of glory may give unto you a Spirit of wisdom and revelation in the knowledge of Him; having the eyes of your heart enlightened, that ye may know what is the hope of His calling, what the riches of the glory of His inheritance in the saints; and what the exceeding greatness of His power to us-ward who believe." And now again he says the same. "That ye may be strong to apprehend with all the saints what is the breadth, and length, and height, and depth;" i.e., to know perfectly the mystery which hath been providentially ordered in our behalf: "and the breadth, and length, and height, and depth;" that is, too, the immensity of the love of God, and how it extends every where. And he outlines it by the visible dimensions of solid bodies, pointing as it were to a man. He comprehends the upper and under and sides. I have thus spoken indeed, he would say, yet is it not for any words of mine to teach you these things; that must be the work of the Holy Spirit. "By His might," saith he, is it that ye must be "strengthened" against the trials that await you, and in order to remain unshaken; so that there is no other way to be strengthened but by the Holy Ghost, both on account of trials and carnal reasonings. Again, if in order to understand the love of God, it was necessary for Paul to pray, and there was need of the indwelling of the Holy Spirit, who by following mere reasonings shall understand the nature of Christ? And why is it a difficult thing to learn that God loveth us? Beloved, it is extremely difficult. For some know not even this; wherefore, they even say, numberless evils come to be in the world; and others know not the extent of this love. Nor, indeed, is Paul seeking to know its extent, nor with any view to measure it; for how could he? but only to understand this, that it is transcendent, and great. And this very thing, he says, he is able to show, even from the knowledge which hath been vouchsafed to us.