Bildad uses these rhetorical questions to rebuke Job for not agreeing with Bildad and the ancestors. They can be translated as statements. Alternate translation: "They will teach you and tell you and speak what they sincerely believe." (See: [[rc://en/ta/man/translate/figs-rquestion]])
Here the word "hearts" represents their inner beliefs. Alternate translation: "that they sincerely believe" (See: [[rc://en/ta/man/translate/figs-metonymy]])