What is the meaning of "TOO BEAUTIFUL TO LAST"?

Question

TOO BEAUTIFUL TO LAST

(Richard Rodney Bennett / Paul Francis Webster)

Engelbert Humperdinck

Also recorded by: Russ Peterson; Kerri Sherwood.

The days of autumn splendor

Those moments, warm and tender

Was it too beautiful to last

The love we share together

The dreams we dare together

Was it too beautiful to last

Walking hand in hand

The dawn discloses

We were dreaming of a land

Where love preposes

But castles made of sand

Like winter roses are fated to die

My darlin', like you and I

My darlin'

Where are those sweet Septembers

The joy my heart remembers

Lost in the shadows of the past

The rainbow watched above you

The sacred words "I love you"

Why did that dream go by so fast

Was it too beautiful

Was it too beautiful to last

Answer 1

It is a play on the expression "too good to last"

meaning that things are going too well/things are too perfect and that it can't last, that something HAS to happen to mess it up