too much for one heart

I found this while searching for lyrics of my favorite Miss Saigon songs. Such a beautiful song but this did not make it to the album..

Outside there is a war,
In here the night is still.
The jasmine buds have bloomed,
The way a jasmine will.
And I have given birth to a speckle of dust,
To a sparkle of light, to a small hint of life.
Frail as a flower in the morning,
Is this tiny work of art,
When I see his face before me,
This is too much for one heart.
Here, like a seedling in the garden,
Is a world about to start,
How I need you here to share it,
This is too much for one heart.
Yours, half of all, this is yours,
And I swear upon the moon,
Soon you will see,
The best of you and me,
In a smile that is shining,
On the face of your son.
All alone, in my arms I hold such beauty,
I want time to stop right here,
Make perfection last forever,
In which I could disappear.
Disappear!
Yours, half of all here, this is yours,
And now I feel you coming near,
Here, you will see,
The best of you and me,
All our stories combining,
In this life we've begun.
I have been living with such wonder,
That my soul could burst apart,
Now or soon we'll be together,
This is too much for one heart.

Here's the video to match..