Halakhah zu Jeschijahu 3:33

You should not walk with an upright [haughty] posture and an outstretched neck, as it is said: "And they walked with outstretched necks."¹³Isaiah 3:16. Nevertheless, you should not bend your head excessively, but only moderately so that you will be able to see anyone approaching you and also see where you are walking. (Rabbeinu Yonah in Sefer Hayirah). From the way a person walks we can tell if he is wise and intelligent, or if he is a fool and a boor. Thus said King Solomon in his wisdom: "Also in the manner that a fool walks his heart fails him, and he announces to all his foolishness,"¹⁴Koheles 10:3. thereby informing everyone that he is a fool.

From the laws of the commandment is that which they, may their memory be blessed, said (Arakhin 16b) that the obligation of this commandment is until hitting - meaning to say that the one rebuking is obligated to multiply his rebukes upon the sinner until it is enough that the sinner is close to hitting the one rebuking. And nonetheless they, may their memory be blessed, also said (Arakhin 16b) that if the one rebuking sees that there is no benefit at all found from the words of his rebukes - from the greatness of the sinner's evil, or that he is deaf [to it] and extremely evil and [the rebuker] is afraid of him that he not stand against him and kill him - that he is not obligated in this commandment with this man. And this is what they, may their memory be blessed, said (Yevamot 65b), "In the same way as it is a commandment to say something that will be heard, so [too,] is it a commandment to be quiet in a place where the thing will not be heard" - since there would be disgrace in the matter for the one who is rebuking and no benefit to the one who is rebuked. And nonetheless, it is for every careful person to consider and to pay great attention to these matters and to think and see if there will be a benefit to the sinner with his words, such that he should rebuke him and trust in God, may He be blessed - as He will help him in his fight with His enemies. And let his heart not be soft and let him not fear, since 'the Lord protects all those that love Him and He obliterates all of the evildoers.' And if the sinner returns, he will have great reward for this. But the one who has in his hand [the possibility of] bringing him back and rebuking him, and does not rebuke him, is caught in his sin. And this is something clear from the words of our Rabbis (Shabbat 55a) and also from Scripture (Isaiah 3:14). And they, may their memory be blessed, also said (Yevamot 65b) that even a minor is obligated to rebuke an adult if he sees the adult going in a path that is not good. [These] and the rest of the details of the commandment are elucidated in scattered [places] in the Talmud (see Mishneh Torah, Laws of Human Dispositions 6).