Charles Ellicott Commentary Psalms 84:7

"They go from strength to strength; Every one of them appeareth before God in Zion." — Psalms 84:7 (ASV)

They go from strength to strength — i.e., each difficulty surmounted adds fresh courage and vigour.

“And he who flagged not in the earthly strife,
From strength to strength advancing, only he
His soul well knit, and all his battles won,
Mounts, and that hardly, to eternal life.”
MATTHEW ARNOLD.

The marginal “from company to company” follows the alternative meaning of the Hebrew word, and suggests a picture of the actual progress of the various bands composing a caravan. But the expression in either sense is hardly Hebrew, and the text is suspicious. It emends easily to “They go to the Temple of the Living God, to see the God of gods in Zion” (Grätz).