There's a Celtic saying, ...

There's a Celtic saying, "Many a time a man's mouth broke his nose.
 Conor McGregor

Quotes from the same author

You need to be able to hit, kick, grapple, wrestle, but for me so much of this is about the mind, about feeling you are in complete control of the space around you, and you know what to do at any moment. That is a wonderful feeling, but it doesn't just happen, you have to work for it, train for it, think about it all the time.
 Conor McGregor
Whoever said it's tough at the top is talking absolute sh*t.
 Conor McGregor
My name, the McGregor name, my family's motto ... means royal is in my blood. That goes way back. So for [Aldo] to say he is the king and I am the joker, if this was a different time, I would invade his favela on horseback and kill anyone that was not fit to work. But we are in a new time. So I'll whoop his ass in July.
 Conor McGregor
Ask José Mourinho, he wouldn't know a thing about me, my sport - he knows football, and to get to high levels you have to be insane, nothing else means anything.
 Conor McGregor
To do anything to a high level it has to be total obsession. Ask José Mourinho, he wouldn't know a thing about me, my sport - he knows football, and to get to high levels you have to be insane, nothing else means anything. I respect all forms of movement and lifestyles, but I am in a bubble. I wake up, it is in my head; I go to sleep, it's in my head, 24/7.
 Conor McGregor