Watchman Nee – Seeing God
“Here is a heart condition God requires for the fulfillment of His purposes of grace. Purity of heart simply means a state where there are no hindrances to seeing God. The kingdom of the heavens is here, so there is no reason why anyone should fail to see Him, unless man himself puts up barriers.
It is not necessary to place a dirty article in front of your eyes to prevent you from seeing an object; a perfectly clean article will do just as well! The “clean heart” of the psalmist has to do with the removal of unclean things; the “pure heart” of the Sermon on the Mount has to do with the removal of all things, clean or unclean. Many have no right knowledge of God because they have numerous competing interests apart from God. Purity of heart corresponds to singleness of eye. It means that God is the exclusive object of attention. From such preoccupation, there will be no loss, “Thy whole body shall be full of light.”
– Watchman Nee
“For where your treasure is, there will your heart be also. The light of the body is the eye: if therefore thine eye be single, thy whole body shall be full of light”