给一段文本内容：

I stand upon a mountaintop
And gaze upon the land
A sea of green and gold and blue
Spreads out on every hand

The valley lies in shadow deep
The hills are crowned with light
And far away against the sky
The mountains blue and white

I feel so small and yet so big
Beneath the open sky
And in this moment, all I know
Is how I love to fly

The birds they wheel and dip and soar
Far up above my head
And in this ancient, timeless place
I feel so very blessed


根据这个文本内容回答问题：

这首诗中表达的感觉是什么？
这首诗中表达的感觉是心旷神怡、自然美景的宏伟和壮美给人以深深的感受，让人感觉自己很渺小，但同时也感到非常幸福和庆幸。