“The upright person will see his face.” The “upright” person is a person who loves and obeys God; who keeps His commandments and follows His ways. The phrase that the upright person will see God’s face is somewhat idiomatic now, and reflects the fact that the upright person will “see” (understand) God and know His ways. However, the phrase is also eschatological and absolutely true. In the new heaven and earth of Revelation 21-22, God will personally be with people and “will live with them, and they will be his people, and God himself will be with them, and be their God” (Rev. 21:3). God appears to some people now, but in the future, He will be visible to everyone.
[For more on God appearing now, see commentary on Gen. 18:1 and Acts 7:55.]