Need help

Hi I found this poem called "To a Waterfowl" by William Cullen Bryant. I tried to understand the poem but I just cant figure out what hes trying to get across in this poem. So can anyone help me what Bryant is trying to get across?

To a Waterfowl

Whither, ‘midst falling dew,
While glow the heavens with the last steps of day,
Far, through their rosy depths, dost thou pursue
Thy solitary way?

Vainly the fowler’s eye
Might mark thy distant flight to do thee wrong,
As, darkly painted on the crimson sky,
Thy figure floats along.

Seek’st thou the plashy brink
Of weedy lake, or marge of river wide,
Or where the rocking billows rise and sink
On the chafed ocean side?

There is a Power whose care
Teaches thy way along the pathless coast,-
The desert and illimitable air, -
Long wandering, but not lost

All day thy wings have fann’d
At that far height, the cold thin atmosphere:
Yet stoop not, weary, to the welcome land,
Though the dark night is near

And soon that toil shall end,
Soon shalt thou find a summer home, and rest,
And scream among thy fellows; reeds shall bend
Soon o’er thy sheltered nest

Thou’rt gone, the abyss of heaven,
Hath swallowed up thy form; yet, on my heart
Deeply hath sunk the lesson thou hast given,
And shall no soon depart.

He, who, from zone to zone,
Guides through the boundless sky thy certain flight,
In the long way that I must tread alone,
Will lead my steps upright.