Who said "Death is not the end; it is merely a transition."?

This quote is attributed to Adam Warlock.

Death is not the end; it is merely a transition. - Adam Warlock

"Death is not the end; it is merely a transition."

Adam Warlock Death

"I am Adam Warlock, born anew to understand the universe."

"My existence is a canvas upon which destiny paints its masterpiece."

"To live is to struggle, to struggle is to grow."

"I have learned that perfection is a cage."

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."