A.T. Robertson Commentary Matthew 5:8

"Blessed are the pure in heart: for they shall see God." — Matthew 5:8 (ASV)

Shall see God (τον θεον οψοντα). Without holiness no man will see the Lord in heaven (Hebrews 12:14). The Beatific Vision is only possible here on earth to those with pure hearts. No other can see the King now. Sin befogs and beclouds the heart so that one cannot see God. Purity has here its widest sense and includes everything.