"Who ever told you life was going to be fair?" (to any kid railing against the Great Unfairness Of It All du jour)
Of guns, power tools, etc-- "You don't have to be afraid of it. You have to respect what it can do." "That (saw, bullet, etc) doesn't know the difference between a hand and a piece of wood."
He had a lot of good advice and insight that have served me well over the years. This is the second Father's Day without him. He is missed.