John Calvin Commentary Psalms 84:4

"Blessed are they that dwell in thy house: They will be still praising thee. Selah" — Psalms 84:4 (ASV)

Blessed are they who dwell in thy house. Here the Psalmist expresses more distinctly the proper and legitimate use of the sanctuary. Thus, he distinguishes himself from hypocrites, who are diligently attentive to the observance of outward ceremonies but lack genuine godliness of heart. David, on the contrary, testifies that the true worshippers of God offer to Him the sacrifice of praise, which can never be dissociated from faith. No one will ever praise God from the heart unless, relying upon His grace, they partake of spiritual peace and joy.