Spurs came from 2-0 down to earn a point at the Amex with late efforts from Richarlison and an own goal from Jan-Paul van Hecke.
Frank said afterwards: "Our start to the game was fantastic. We are coming away from home against a very good team and we are completely dominating it. And then out of nothing, without even a first sniff of danger, they are one on one with our keeper.
"So fair play to Brighton. We could have done better in that situation. And then the second goal we concede, Vic has to do better, he knows and agrees.
"But the mentality that we showed today, I was so impressed with. The mentality to stay in the game, to keep going, to keep pushing and come back and get a well-deserved 2-2.
"I actually think that, overall, if there should have been a winner, it should have been us. So many crosses into the box, near chances, missed opportunities. We were physically strong and mentally strong, and that is so important if you want to achieve something."
"(Mohammed) Kudus was probably our man of the match. He was so dangerous. He owned that right hand side. The own goal he got an assist for, he made the run across to put them in doubt.
"I think this is our best performance of the season. Overall, it was very good in many phases. Yes, we gave the two goals away, but one was good by Brighton, and the other was a mistake.
"Apart from that, we controlled it and were very good in every phase of the game."