Luke 14:19

He who has bought five yoke of oxen is he who neglects his intellectual nature, and follows the things of sense, therefore he cannot comprehend a spiritual nature.

(Serm. 112.) The five yoke of oxen are taken to be the five senses of the flesh; in the eyes sight, in the ears hearing, in the nostrils smelling, in the mouth taste, in all the members touch. But the yoke is more easily apparent in the three first senses; two eyes, two ears, two nostrils. Here are three yoke. And in the mouth is the sense of taste which is found to be a kind of double, in that nothing is sensible to the taste, which is not touched both by the tongue and palate. The pleasure of the flesh which belongs to the touch is secretly doubled. It is both outward and inward. But they are called yoke of oxen, because through those senses of the flesh earthly things are pursued. For the oxen till the ground, but men at a distance from faith, given up to earthly things, refuse to believe in any thing, but what they arrive at by means of the five-fold sense of the body. "I believe nothing but what I see." If such were our thoughts, we should be hindered from the supper by those five yoke of oxen. But that you may understand that it is not the delight of the five senses which charms and conveys pleasure, but that a certain curiosity is denoted, he says not, I have bought five yoke of oxen, and go to feed them, but go to prove them.

And another said: I have bought five yoke of oxen, and I go to prove them. I pray thee, have me excused. What do we understand by the five yokes of oxen, if not the five senses of the body? Which are rightly also called yokes, because they are doubled in both sexes. These bodily senses, namely, since they are unable to comprehend what is internal but only know externals, and forsaking inner things touch only what is outside, rightly signify curiosity through them. For curiosity is indeed a serious vice, which, while leading anyone's mind to investigate the outward life of another, always hides its own inner things from him. For this reason, it is also said of these same five yokes of oxen: I go to prove them, because indeed sometimes examination pertains to curiosity. But it should be noted that both he who excuses himself from the supper of his inviter on account of the farm, and he who excuses himself on account of proving the yokes of oxen, mixes words of humility, saying: I pray thee, have me excused. For while he says "I pray," and yet scorns to come, humility sounds in his voice, pride in his action. And behold, the wicked each judge this when they hear it, yet do not cease to do the things they judge. For when we say to anyone acting perversely: Turn, follow God, leave the world, where do we call them if not to the Lord's supper? But when they respond: Pray for me, for I am a sinner, I cannot do this, what else do they do but request and excuse themselves? For saying, "I am a sinner," indicates humility, but adding, "I cannot turn," demonstrates pride.