Matthew 5:8

“Blessed are the pure in heart, etc.] Not in the head; for men may have pure notions and impure hearts; not in the hand, or action, or in outward conversation only; so the Pharisees were outwardly righteous before men, but inwardly full of impurity; but “in heart”. The heart of man is naturally unclean; nor is it in the power of man to make it clean, or to be pure from his sin; nor is any man in this life, in such sense, so pure in heart, as to be entirely free from sin. This is only true of Christ, angels, and glorified saints: but such may be said to be so, who, though they have sin dwelling in them, are justified from all sin, by the righteousness of Christ, and are “clean through the…”

“Blessed are the pure in heart: for they shall see God--Here, too, we are on Old Testament ground. There the difference between outward and inward purity, and the acceptableness of the latter only in the sight of God, are everywhere taught. Nor is the "vision of God" strange to the Old Testament; and though it was an understood thing that this was not possible in the present life (Exo 33:20; and compare Job 19:26-27; Isa 6:5), yet spiritually it was known and felt to be the privilege of the saints even here (Gen 5:24; Gen 6:9; Gen 17:1; Gen 48:15; Psa 27:4; Psa 36:9; Psa 63:2; Isa 38:3, Isa 38:11, &c.). But oh, with what grand simplicity, brevity, and power is this great fundamental truth…”

“Blessed are the pure in heart - That is, whose minds, motives, and principles are pure; who seek not only to have the external actions correct, but who desire to be holy in heart, and who are so. Man looks on the outward appearance, but God looks on the heart. They shall see God - There is a sense in which all will see God, Revelation 1:7. That is, they will behold him as a Judge, not as a Friend. In this place it is spoken of as a special favor. So also in Revelation 22:4, “And they shall see his face.” To see the face of one, or to be in the presence of any one, were terms among the Jews expressive of great favor. It was regarded as a high honor to be in the presence of kings and princes,…”

“The pure in heart - The sanctified: they who love God with all their hearts. They shall see God - In all things here; hereafter in glory. Matthew 5:9”

“5:8 Those whose hearts are pure (see Pss 24:3-5; 51:7; Isa 6:5) are contrasted with those who thought that they had satisfied God’s will through ceremonial conformity to tradition (Matt 23:25-26). Jesus insisted on simple, true heart-righteousness (see 6:1-24; 15:1-20; 23:23-28; Deut 6:5). • They will see God and thereby attain even more than Moses did (see Exod 33:18-23; 34:5-7; see also Ps 73:1).”

“are: Mat 23:25-28; Ch1 29:17-19; Psa 15:2, Psa 18:26, Psa 24:4, Psa 51:6, Psa 51:10, Psa 73:1; Pro 22:11; Eze 36:25-27; Act 15:9; Co2 7:1; Tit 1:15; Heb 9:14, Heb 10:22; Jam 3:17, Jam 4:8; Pe1 1:22 for: Gen 32:30; Job 19:26, Job 19:27; Co1 13:12; Heb 12:14; Jo1 3:2, Jo1 3:3 Matthew 5:9”