Defender Jeremy Mathieu headed in the only goal of the match in the 73rd minute to ensure Barcelona kept hold of their four-point lead over rivals Real Madrid, who demolished Granada 9-1 earlier in the day.
"We were up against a team which were flying, that is why we could not control the game," Enrique said in the post-match press conference. "These games strengthen you, there are games in which you have to work for it. These games against very tough opponents will prepare us for what is left to play. Winning is never bad, these are three marvellous points."
Barcelona had numerous opportunities to score during the match, but striker Neymar was denied a goal in the second half when he was ruled to be offside.
Fellow striker Lionel Messi could have given Barcelona a 2-0 lead after Mathieu's goal but failed to convert his one-on-one attempt.
"We could have finished the game earlier, but the game was open all the way through," Enrique said. "We did not give up many chances, but neither did we create lots.
"It is in these games that the quality of the players is determinant. The effort they put in during the first half took a toll in the second. We had more control of the game then, but I knew it would be a difficult game, as Celta are one of best teams pressing the ball."
Meanwhile, Enrique refused to say whether midfielder Xavi Hernandez would be leaving Barcelona for Qatari side Al-Sadd next season.
"I have already said everything about Xavi," he said. "He is the player with most games ever for Barca and will decide his own future when it is best for him. People said he was going to leave last summer too. I can just say that he looks very focused on this end of the season, trying to win as many trophies as possible."