Shall not they teach thee - The results of human conduct, and the great principles on which God governs the world.
And utter words out of their heart - Dr. Good renders this,
"And well forth the sayings of their wisdom,"
And supposes it means that the words of wisdom would proceed from them as water bubbles from a fountain. But this, I think, is a mere conceit. The true sense is, that they would not speak that merely which comes from the mouth, or that which comes upper most, and without reflection - as the Greeks say, λέγειν πᾶν ὅ τι ἐπὶ στόμα ἔλθῃ legein pan ho ti epi stoma elthē; or, as the Latins, Quicquid in buccam venerit loqui - to speak whatever comes in the mouth; but they would utter that which came from the heart - which was sincere, and the result of deep and prolonged reflection. Perhaps, also, Bildad means to insinuate that Job had uttered what was uppermost in his mind, without taking time for reflection.

Shall not they teach thee - Wilt thou not treat their maxims with the utmost deference and respect? They utter words from their heart - what they say is the fruit of long and careful experience.

Shall not they teach thee, and tell thee,.... That is, the men of the former age, and their fathers before them, Job is directed to inquire of, and to prepare for a search into their records and traditions; from whom he might reasonably expect to be taught and told things that would be very instructive and useful to him in his present circumstances:
and utter words out of their heart? such as were the effect of mature judgment and long observation, and which they had laid up in their hearts, and brought out from their treasure there; and, with the greatest faithfulness and sincerity, had either committed them to writing, or delivered them in a traditionary way to their posterity, to be communicated to theirs; and which might be depended upon as true and genuine, being men of probity, uprightness, and singleness of heart; who declared sincerely what they knew, and spoke not with a double heart, having no intention to deceive, as it cannot be thought they would impose upon their own children; and therefore Job might safely receive what they uttered, and depend upon it as truth and fact; and what they said, as Jarchi observes, is as follows; or what follows Bildad collected from them, and so might Job, and think he heard them "saying", as Piscator supplies the text, what is expressed in the following verses, if not in their words, yet as their sense.

teach thee-- Job 6:24 had said, "Teach me." Bildad, therefore, says, "Since you want teaching, inquire of the fathers. They will teach thee."
utter words--more than mere speaking; "put forth well-considered words."
out of their heart--from observation and reflection; not merely, from their mouth: such, as Bildad insinuates, were Job's words. Job 8:11-13 embody in poetic and sententious form (probably the fragment of an old poem) the observation of the elders. The double point of comparison between the ungodly and the paper-reed is: 1. the luxuriant prosperity at first; and, 2. the sudden destruction.

Utter - Not partially, but sincerely, speaking their inward thoughts; not rashly, but from deep consideration; not by hearsay, but their own knowledge.