Muskurana hi to Khushi nahi hoti,
Umer Bitana hi to zindagi nahi hoti,
Khud ko mitana Parta Hai Dosti mein,
Kyun k Sirf Dost Kehene se Hi Dosti Nahi Hoti..
We cannot tell the precise moment when friendship is formed. As in filling a vessel drop by drop there is at last a drop which makes it run over, so in a series of kindness there is at last one which makes the heart run over.