The victory put the Bhoys eight points clear at the top of the Scottish Premier League table but Lennon said that gap could certainly be bridged by their Glasgow rivals if they get too carried away.
"No. Other people might say it was a pivotal day," he said when asked if he felt more comfortable about this season's title.
"We are very pleased, we are more than pleased, because that was emphatic.
"There are still 12 or 13 games to go in the season. In 2005, we had six or seven games left and still lost the league so there is still a lot of football to be played.
"It's going to get a bit more fraught and tense between now and the end of the season and I'm hoping we have the mentality to handle that."
But despite the resistance to fall into a fall sense of security, Lennon did praise the performance of his charges.
"It was a wonderful performance and the team did everything we asked of them. I couldn't be happier with them," he added.
"It was a real acid test, as people were calling it before the game. Could this team get over the line? They answered all the questions today.
"It's not just Rangers, since the turn of the year we have played very well against all the opposition we have faced.
"Today was a big day in the context of the season and it will give the players a huge lift, a huge shot in the arm, because Rangers are a good team, a strong team, but we played very well.
"For the first time in a while, we are in charge again and it's in our hands and not theirs. As a team, as a collective, we were excellent today."