This thought was sparked by a post elsewhere in blogdom and it's not a current issue for me at the moment, so I thought I'd post it now.
If you want to do a very small thing to be kind to your minister, don't give him or her letters to deliver to other people that you could easily put in the post or deliver yourself.
1) The minister probably has a list of 50 small things like that to do and the longer the list gets, the more stress it creates. Personally speaking, I'm not kidding when I say I'm afraid I'll forget; don't laugh it off because you think 'I'm young'. It's not my age, it's the number of things on the to do list.
2) In many cases, the minister will either have to get in the car specifically to deliver your letter or will have to put it in the post himself. If she does the former, the cost of petrol might very well exceed the cost of the stamp not to mention the cost of CO2 to the environment.
3) Because who thought kindness to your minister could be bought for the price of a 2nd class stamp? Post that letter and give yourself a pat on the back and say 'Well done.'