I'd give VERY different advice to my younger self!

Trust no one.

Assume hostility.

If you have to hit, then hit first, hit fast, hit hard, hit dirty and most of all, hit from behind!

Whatever the cost in pain, money or status, never compromise your integrity.

Never forget, never forgive.

Don't be sorry - be better.

Avoid entanglements.

Never try to be happy when you can be content.