Charles H. Spurgeon on Psalms 36:9

In thy light shall we see light. There is a great boast of light in the world, and there is some ground for it in natural things; but, as of old the world by wisdom knew not God, so of late. If ever we know God, it must be through he medium of his word. This I take to be the meaning of the passage. The term light in the last clause means the true knowledge of God; and, in the first, the true medium of attaining it, namely, divine revelation. The sum seems to amount to this: the word of God is the grand medium by which we can attain a true and saving knowledge of God. What the sun and stars are to the regions of matter, that revelation is to the mental region. Ge 1:13,17. ...There are many things of which you may entertain no doubt, concerning which there may be no manner of dispute; yet, make a point of seeing them in God's light. Many content themselves with seeing them in the light in which great and good men have placed them; but, though angels, they are not the true light: they all view things partially. If what they say be true, yet, if we receive it merely on their representation, our faith will stand in the wisdom of men, and not in the power of God. 1Co 2:5. That knowledge or faith which has not God's word for its ground will not stand in the day of trial. Andrew Fuller.