According to People, Pitt had a hard time finding the right words to describe what being a father means, but in a few words expressed, "It is everything."
He then added, "The hardest job in the world, the most rewarding job in the world."
In an interview with Larry King, the actor explained that coming home from work and having dinner with his children, even when there is discipline involved, gives a feeling of accomplishment.
The actor added that even if three of his four children are adopted, he does not make any distinctions between them.