Matthew 5:8 (ESV) … “Blessed are the pure in heart, for they shall see God.”
How few of us live one life and live it in the open! We are tempted to wear a different mask and play a different role according to each occasion. This is not reality but play-acting, which is the essence of hypocrisy. Some people weave round themselves such a tissue of lies that they can no longer tell which part of them is real and which is make-believe. Alone among men Jesus Christ was absolutely pure in heart, being entirely guileless.
Only the pure in heart will see God, see him now with the eye of faith and see his glory in the hereafter, for only the utterly sincere can bear the dazzling vision in whose light the darkness of deceit must vanish and by whose fire all shams are burned up.
 Stott, J. R. W., & Stott, J. R. W. (1985). The message of the Sermon on the mount (Matthew 5-7): Christian counter-culture (pp. 48–49). Leicester; Downers Grove, IL: InterVarsity Press.