How does a friendship grow?

Theres not a whole lot of things that are eternal. Because gold, jewels, fine clothes, expensive cars and houses are all the values false and temporary. Over time they depreciate, break down, deteriorate, and cease to be fashionable. But among the eternal, the true values can be called three things. Is faith, love and friendship. "A true friend is the greatest treasure", "a true friend is known in trouble" — how often we hear these Proverbs, but we seldom think of their real valuе .