"I think it is the best goal in my life," Son, 27, said.
"I don't know what happened until the end! When I got the ball l tried to pass to Dele Alli and waited for his movement.
"But I couldn't find him so I just went and went.
Manchester United manager Ole Gunnar Solskjaer speaking to BBC Match of the Day: "We will remember this one - we look so dangerous when we get he ball and go forward against arguably the best team in the world.
Everton caretaker manager Duncan Ferguson: "It was an unbelievable atmosphere for myself but it's the players who need to take the pride and the praise. We were just trying to get the communication working.
Arsenal interim boss Freddie Ljungberg: "We didn't show up in the first half, didn't work hard and want to play.
"Second half we had a word and were better but we are suspect on the counter and we have no confidence.
Liverpool manager Jurgen Klopp, speaking to Match of the Day: "All the goals were incredible, outstanding. Wonderful goals, sensational passes, super pieces of football. I loved it a lot!
"We needed fresh legs and I had to show my respect to the boys in the squad, that's all.
Wolves manager Nuno Espirito Santo, speaking to Match of the Day about their 10-match unbeaten league run: "I'm proud of the players and fans. Everybody was part of it. Everything we've achieved is common effort.
Southampton manager Ralph Hasenhuttl told BBC Sport: "It is clear we used a lot of energy in the first 70 minutes, until 2-1 it was a good game from us. They thought something was possible for them and in the last 15 minutes we were a bit tired.
Manchester United manager Ole Gunnar Solskjaer speaking to BBC Sport: "You are always happy when you win. The boys are learning and improving all the time but tonight we were fantastic for long, long spells.
Leicester boss Brendan Rodgers, speaking to Match of the Day: "It was a tough game for us. Hayden Mullins had Watford very well organised. We had to be patient this evening and worked very hard for that but I thought we deserved it.
Chelsea manager Frank Lampard:
"I thought we were great. I'm pleased because that was us again, we had a blip against West Ham and today we were back.
"Our character at half-time was important and we carried off where we left off.
"Sergio is a legend of football. I have to score when I play because Sergio scores every time," Jesus said after the game.
Guardiola told BBC Sport: "We need him. I am so glad for him because he is an incredible fighter.