Dad had a big hand in shaping the world you know: the home where you grew up, the talents that define you, the view from your bedroom, and your view of the future. As your protector and your provider, Dad masterfully balanced keeping you safe in his arms and putting you out there to take risks. He has a way of making a point, making you laugh, and making even your worst day be okay.

When you were born, Dad changed his world to put his fears behind him and your interests up front. He gave up habits and hobbies to give you advice. He left behind pride and shame and friends and maybe fashion. He saw a whole universe of hopes and dreams and possibilities and set their orbit around you. He changed his world to do it, and in that course, he changed your world, too.

Did it work? Maybe not the way he or you expected. But enough to take a few minutes this Father’s Day to think about how the guy you know became that guy called Dad. Think about how he changed your days, changed your mind, changed your world.

And tell him.