I saw some images on friendship in adarsh blog which are very impressive
Love is rarer than genius itself. And friendship is rarer than love
No man is useless while he has a friend
Wishing to be friends is quick work, but friendship is a slow-ripening fruit
The language of friendship is not words but meanings.
However rare true love may be, it is less so than true friendship
A sympathetic friend can be quite as dear as a brother