Matthew 5:8

Blessed [are] the pure in heart. The Jew, under the tuition of the Pharisees, cared little for the state of the heart, so that outward forms were duly kept. Jesus, however, demands that the heart, the affections, the mind, shall be purified, as the fountain from whence flows the moral and religious life. A pure heart begets a pure life; an impure heart, a corrupt life.

They shall see God. Not with the natural eye, but the spiritual vision; by faith. In the pure heart the Lord will dwell and his presence will be recognized. See Joh 14:23.
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