Dear brothers and sisters in Christ, my family and those whom God loves:
One generally collects things that have some kind of value. Tax collectors in the New Testament collected taxes because they benefited from it. St. Paul also collected, but in his case it was money to help the poor. Hobby collectors collect postage stamps and many other things, not normally for financial gain, but for the joy of bringing together small pieces of history or just beauty.
I started pulling together a history of stamp collecting, but I found the video below that does a far better job than my writing.
Grace be with you,