Andy Lau has achieved a little when he sang this song. Although the songwriter of this song is not Andy Lau, he has this experience. And the "horizon" in what you said "if you want to fly high, you should forget the horizon" is not a concern or a constraint, but it is precisely his achievement. It means, don't be limited to the present, don't be covered by the small achievements in front of you, and forget these achievements.

At the same time, it also shows that he wants to fly higher and farther on his own stage, and it is gratifying that he has done it.