(79) Who sees? Who leads?

He summoned the crowd and said to them, «Hear and understand. It is not what enters one’s mouth that defiles that person; but what comes out of the mouth is what defiles one.» Then his disciples approached and said to him, «Do you know that the Pharisees took offense when they heard what you said?» He said in reply, «Every plant that my heavenly Father has not planted will be uprooted. Let them alone; they are blind guides (of the blind). If a blind person leads a blind person, both will fall into a pit.» Then Peter said to him in reply, «Explain (this) parable to us.» He said to them, «Are even you still without understanding? Do you not realize that everything that enters the mouth passes into the stomach and is expelled into the latrine? But the things that come out of the mouth come from the heart, and they defile. For from the heart come evil thoughts, murder, adultery, unchastity, theft, false witness, blasphemy. These are what defile a person, but to eat with unwashed hands does not defile.» (Matt 15:10-20)

You who are deaf, listen, you who are blind, look and see! Who is blind but my servant, or deaf like the messenger I send? You see many things without taking note; your ears are open, but without hearing. Though it pleased the LORD in his justice to make his law great and glorious, (Is 42:18-21)

Give your servant, therefore, an understanding heart to judge your people and to distinguish right from wrong. For who is able to govern this vast people of yours?» The LORD was pleased that Solomon made this request. (1 Kin 3:9-10)

Yet with his great knowledge the LORD makes men unlike; in different paths he has them walk. Some he blesses and makes great, some he sanctifies and draws to himself. Others he curses and brings low, and expels them from their place. Like clay in the hands of a potter, to be molded according to his pleasure, So are men in the hands of their Creator, to be assigned by him their function. As evil contrasts with good, and death with life, so are sinners in contrast with the just; See now all the works of the Most High: they come in pairs, the one the opposite of the other. (Sir 33:11-15)

Whoever observes the day, observes it for the Lord. Also whoever eats, eats for the Lord, since he gives thanks to God; while whoever abstains, abstains for the Lord and gives thanks to God. (Rom 14:6)