Question

"Best friends are passing clouds" Comment.​

Answer 1

Yes it can correct that best friends are passing clouds because they cane in life and then came to any other way.

But it is not necessarily

Answer 2

A good friend knows all your best stories, but a best friend has lived them with you." “Many people will walk in and out of your life, but only true friends leave footprints in your heart.” “There's nothing like a really loyal, dependable, good friend. Nothing.”