The Brazilian's long-range second-half drive broke the deadlock before two more goals from Jermain Defoe secured the win and helped take the north London side up to fourth in the Premier League.
"I'm very happy, so so happy," the 23-year-old told the club's official website.
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"It's my first goal of the season but I'm happy because we won. It was a great win. Everyone played really well and we have to continue playing like this.
"The supporters were fantastic again, right behind us all the time. We're all delighted."
The midfielder was evidently pleased to get on the scoresheet and admitted it is an area of his game that needs improvement.
"Sometimes you have to shoot!" he continued. "I have to shoot more, to try more. It was a good goal. I'm happy because it was an important goal."