That it might be fulfilled which was spoken by the prophet, saying - (Psa 78:2, nearly as in the Septuagint).
I will open my mouth in parables, etc. - Though the Psalm seems to contain only a summary of Israelitish history, the Psalmist himself calls it “a parable,” and “dark sayings from of old” - as containing, underneath the history, truths for all time, not fully brought to light till the Gospel day.