The England striker powered home Ben Davies' cross in the 49th minute to avenge Spurs' 2-0 defeat at the Emirates Stadium in November in the first north London derby to take place at Wembley since 1993.
It might be too early to talk about that right now, given Tottenham's lack of silverware to back it up.
Spurs are unbeaten in eight league games but have drawn three of the last five. "Manchester United decided that once they were in the semi-final [last season], we are far from the semi-final".
"For me, it's a very disappointing result because the priority has to be to get into the Champions League from the Premier League [top-four finish]". I'm not a great fan of qualifying for the Europa League through the Champions League.
Henrikh Mkhitaryan has set up three Premier League goals in 120 minutes of action for Arsenal, as many as Alexis Sanchez managed in 1507 minutes for the Gunners this season.
"It's a game we couldn't afford to lose, of course".
Harry Kane has scored six goals in six league games against Arsenal.
"There's still plenty of games to play", Bellerin said.
"Possession is basically 50/50 in this game".
"In the first half we missed three or four opportunities on the counter attack which is hard to swallow, always the final ball".
Kane's towering second-half header was the difference between the two sides but in truth Spurs were in complete command and should really have won by more - one of the main reasons for that dominance being the magnificence of Belgium star Mousa Dembele.
"In the final part of the game, we should have come back to 1-1".
The game ended 1-0 for the home side as the Gunners continue to suffer from their inconsistent form.
The Spurs striker, seemingly on a one-man mission to see off Arsenal, thumped a volley straight at Cech with 55 minutes gone, and the visiting keeper tipped away a Christian Eriksen free kick soon afterwards.