Charles H. Spurgeon on Psalms 78:2

Parable. Dark sayings. lvm, an authoritative weighty speech or saying. The Hebrew term very nearly answers to the Greek, kuriai doxai, i.e., authoritative sentences or maxims, or weighty sayings, expressing or implying a comparison, as such sayings frequently do. hdyx an enigma, a parable, which penetrates the mind, and when understood makes a deep impression of what is intended or represented by it. Here twdyx seems to refer to the historical facts mentioned in the subsequent part of the Psalm, considered as enigmas of spiritual concern. John Parkhurst.