Don't praise your own good shots. Leave that function to your partner, who, if a good sort, will not be slow in performing it. His praise will be more discriminating and worth more than yours. And don't say spiteful and unkind things about his good shots, or be continually talking about his luck. If you do he will hate you before the game is over.
When a hole is being keenly contested, and you look as though you are having the worst of it, try not to appear pleased when your opponent makes a bad stroke or gets into serious trouble, however relieved or even delighted you may feel. It is human nature to feel the better for your opponent's mistake in a crisis of this kind, but it is not good manners to show that you feel it. And, however well you may know your friend, it is not half so funny as you think it is to laugh at such a time or shout out that you rejoice. It is simply bad taste, for your opponent at that time is suffering from a sense of keen disappointment, and is temporarily quite unable to appreciate jokes of this kind. He is inclined to think he has been mistaken in you all along, and that you are much less of a gentleman and a sportsman than he had imagined.
If he is playing several more in a vain endeavour to extricate himself from a bunker, do not stand near him and audibly count his strokes. It would be justifiable homicide if he wound up his pitiable exhibition by applying his niblick to your head. It is better to pretend that you do not notice these things. On the other hand, do not go out of your way to say that you are sorry when these misfortunes happen. Such expressions imply a kind of patronage for which your opponent will not thank you, and he knows all the time that you do not really mean it, and therefore infers that you are a hypocrite. The best golf is that which is played in comparative silence.
At the beginning of a match do not worry yourself with the idea that the result is likely to be against you. By reflecting thus upon the possibilities of defeat one often becomes too anxious and loses one's freedom of style.
Take more risks when you are down to your opponent than when you are up on him. If you play a difficult shot successfully, the circumstance will probably have some effect upon the other man.