C. F. Keil and Franz Delitzsch on Psalms 25:5

Psa 25:5

His truth is the lasting and self-verifying fact of His revelation of grace. To penetrate into this truth and to walk in it (Psa 26:3; Psa 86:11) without God, is a contradiction in its very self. Therefore the psalmist prays, as in Psa 119:35, οδήγησόν με ἐν τῇ ἀληθείᾳ σου (lxx Cod. Alex.; whereas Cod. Vat. ἐπὶ τὴν..., cf. Joh 16:13). He prays thus, for his salvation comes from Jahve, yea Jahve is his salvation. He does not hope for this or that, but for Him, all the day, i.e., unceasingly,Hupfeld thinks the accentuation inappropriate; the first half of the verse, however, really extends to ישׁעי, and consists of two parts, of which the second is the confirmation of the first: the second half contains a relatively new thought. The sequence of the accents: Rebia magnum, Athnach, therefore fully accords with the matter. for everything worth hoping for, everything that can satisfy the longing of the soul, is shut up in Him. All mercy or grace, however, which proceeds from Him, has its foundation in His compassion and condescension.