Blessed are the pure in heart: for they shall see God.
All Commentaries on Matthew 5:8 Go To Matthew 5
Augustine of Hippo
AD 430
How foolish, therefore, are those who seek God with these outward eyes, since He is seen with the heart! As it is written elsewhere, And in singleness of heart seek Him. For that is a pure heart which is a single heart: and just as this light cannot be seen, except with pure eyes; so neither is God seen, unless that is pure by which He can be seen.