To give a person an opinion one must first judge well whether that person is of the disposition to receive it or not.

When someone is giving you his opinion, you should receive it with deep gratitude even though it is worthless. If you don’t, he will not tell you the things that he has seen and heard about you again. It is best to both give and receive opinions in a friendly way.

Surely when a man is painting a picture he ought not refuse to hear any man's opinion... Since men are able to form a true judgement as to the works of nature, how much more does it behoove us to admit that they are able to judge our faults. Therefore you should be desirous of hearing patiently the opinions of others, and consider and reflect carefully whether or no he who censures you has reason for his censure; and correct your work if you find that he is right, but if not, then let it seem that you have not understood him, or, in case he is a man whom you esteem, show him by argument why it is that he is mistaken.

In offering one’s opinion, one must first ascertain whether or not the recipient is in the right frame of mind to receive counsel.

When we want to correct someone usefully and show him he is wrong, we must see from what point of view he is approaching the matter, for it is usually right from that point of view, and we must admit this, but show him the point of view from which it is wrong. This will please him, because he will see that he was not wrong but merely failed to see every aspect of the question. Now, no one is annoyed at not seeing everything, but no one wants to be wrong; the reason for that may be that man is not by nature able to see everything, and by nature cannot be wrong from the point of view he adopts, as sense impressions are always true.

When I hear another express an opinion which is not mine, I say to myself, he has a right to his opinion, as I to mine. Why should I question it? His error does me no injury, and shall I become a Don Quixote, to bring all men by force of argument to one opinion? ...Be a listener only, keep within yourself, and endeavor to establish with yourself the habit of silence, especially in politics.

They do not try to inform people of their ignorance. When you accuse someone of being wrong, you close them off to considering another perspective by heightening their defenses. If you first validate their stance (“That’s interesting, I never thought of it that way…”) and then present your own opinion (“Something I recently learned is this…”) and then let them know that they still hold their own power in the conversation by asking their opinion (“What do you think about

True opinions are a fine thing and do all sorts of good so long as they stay in their place; but they will not stay long. They run away from a man's mind, so they are not worth much until you tether them by working out the reason. Once they are tied down, they become knowledge, and are stable.

Don't judge a man by his opinions, but what his opinions have made of him.

Consider how many times you have gossiped about the person you love the most to gain the support of others for your point of view. How many times have you hooked other people’s attention, and spread poison about your loved one in order to make your opinion right? Your opinion is nothing but your point of view. It is not necessarily true. Your opinion comes from your beliefs, your own ego, and your own dream. We create all this poison and spread it to others just so we can feel right about our own point of view.

If you give people a firm opinion, you run the risk of being wrong. Guess what? People remember when you’re wrong a lot more often than when you’re right. So the tendency is to include all the possibilities. It’s intellectually honest, even.

If someone has the courage to admit they were wrong, you should have the grace to give them credit for admitting it. Rubbing it in encourages them to never admit being wrong again.

If you want to change someone’s mind, you must understand what need shapes his or her opinion.

To free a man from error is to give, not to take away. Knowledge that a thing is false is a truth. Error always does harm; sooner or later it will bring mischief to the man who harbors it. Then give up deceiving people; confess ignorance of what you don't know, and leave everyone to form his own articles of faith for himself. Perhaps they won't turn out so bad, especially as they'll rub one another's corners down, and mutually rectify mistakes. The existence of many views will at any rate lay a foundation of tolerance. Those who possess knowledge and capacity may betake themselves to the study of philosophy, or even in their own persons carry the history of philosophy a step further.