Charles Ellicott Commentary Isaiah 26:7

"The way of the just is uprightness: thou that art upright dost direct the path of the just." — Isaiah 26:7 (ASV)

The way of the just is uprightness. —The English version seems somewhat redundant. Better, is straight, or is even—that is, it leads on without interruption to its appointed end.

So, in the second clause, instead of “thou shalt weigh the path,” which conveys a thought that is difficult to understand, we render, make smooth the path. Probably, too, the word translated, “most upright,” as if it were a vocative, should be taken adverbially.

The verse is, as it were, an echo of Proverbs 4:26; Proverbs 5:6; Proverbs 5:21.