Naofumi Hataya on The Best of Sonic the Hedgehog Part 2: True Colors:

Cosmic Eternity - Believe in Yourself

This is a song as long as 16 years ago, so it cannot hide its oldness indeed, but it is a vocal song that I worked with for the first time as a job and is a song with a lot of memories. It is a composition that came up with conservative quality of pop, but it is a song that I created after being crushed to pieces entirely by the director of that time and it becomes a song in which my youth and passion were put into. “The moment I communicate with the director” … that is the project’s first crisis. The music of Sonic CD started with creating this ending theme first of all.