The Manchester City star said that the match was a "character test" which the squad passed with flying colours.
"It's not easy to play Brazil, they are a wonderful team. But the power we have as a team showed today. We were magnificent in the first half," BBC Sport quotes De Bruyne as saying.
"Second half it was very difficult, they had a lot of players in the middle. In the last 15 minutes it was a character test and we showed the world what we are capable of.
"I was waiting a little bit for my goal, I saw the space and to hit it like that is nice. We created problems up front with runs from deep, it is wonderful.
"You have to grow as a player and as a team. Obviously it is difficult, in a tournament one loss and you are out but we tried everything. We are here to try and win the World Cup, obviously everyone tries. We are one win away from the game everyone wants to be in."
Belgium will take on France in the semi-finals of the competition.