Friendship.
To my mind friendship can't be compared with anything. It is a sacrifice for someone else. It's very difficult to be a true friend. You should always keep your frieds. The most important feeling that exists between friends is trust. It newer appears by itself, it's the result of a long friendship and this feeling is very valuable. Respect and tolerance are also very important; it means that you don't criticize your friend's way of living, but try to understand him, discuss problems with him and explain to him what you think is good and what is bad. A friend is a person who can help you in time, lend you any sum of money for a long period of time without any percent, whom you can wake up in the middle of the night just to say you feel worried or who is eager to do everything for you waiting nothing in return, who supports you in all your beginnings and who will never betray you.
Lucky are those people who have friends. I'm happy to have lots of friends, too. Some of them are very close, some are less. But all of them make my life interesting and enjoyable.