Job 39:9

"Is the unicorn willing to serve you?" This animal, as is reported, is similar to an ox and is found in the austral regions, armed with a single horn. In the unicorn, whoever is not subjected at all to the bondage of the world is …

Just as the ass serves man for carrying heavy loads, and the wild ass finds his habitat in wild places, so also among domesticated animals the ox serves man for plowing because of his strength. He is compared to the rhinoceros or unicorn among wild …

Will the rhinoceros be willing to serve thee? [MYSTICAL INTERPRETATION] 29. But perhaps before we discuss this strength and neighing of the horse, some persons are desirous of having both the strength of the rhinoceros, and the folly of this ostrich explained in another way, putting aside their moral meaning. For the word of God is manna, and gives, in truth, that taste in the mouth of the eater, which the wish of him who partakes it rightly desires. The word of God is the earth, which produces fruit more abundantly, the more the labour of the enquirer demands.

Will the rhinoceros be willing to serve thee? 2. For the rhinoceros is quite of an untamed nature, so that, if it is ever taken, it cannot in any way be kept. For, as is said, it dies immediately from being unable to bear it. But its name when interpreted means in the Latin tongue, 'a horn on the nostril.' And what else is designated by the nostril, but folly; what by the horn, but pride? For that folly is usually understood by the nostril, we have learned on the evidence of Solomon, who says; As a ring of gold in a swine's nostrils, so is a beautiful and foolish woman. [Prov. 11, 22] For he saw heretical doctrine shining with brilliancy of eloquence, and yet not agreeing with the proper understanding of wisdom, and he says, A ring of gold in a swine's nostrils; that is, a beautiful and involved expression in the understanding of a foolish mind: from which gold depends, through its eloquence, but yet, through the weight of earthly intention, like a swine, it looks not upwards. And he proceeded to explain it, saying, A beautiful and foolish woman: that is, heretical teaching; beautiful in words, foolish in meaning. But, that pride is frequently understood by a horn, we have learned on the evidence of the Prophet, who says; I said to the wicked, deal not wickedly, and to the sinners, lift not up your horn. [Ps.75, 4] What is, therefore, designated by this rhinoceros, but the mighty of this world, or the supreme powers themselves of the kingdoms therein, who, elated by the pride of foolish boasting, whilst they are puffed up by false honour without, are made inwardly destitute by real miseries? To whom it is well said; Why boastest thou, O dust and ashes? [Ecclus. […]

Will the unicorn be willing to serve thee? - In the previous part of the argument, God had appealed to the lion, the raven, the goats of the rock, the hind, and the wild ass; and the idea was, that in the instincts of each of these classes of animals, there was some special proof of wisdom.