This may be misattributed. It appears to be a direct and original quote from "Individuality and encounter: a brief journey into loneliness and sensitivity groups" by Dr Clark E Moustakas (1971 p15, prev 1968)
Attributed

“Oh, it’s home again, and home again, America for me!
I want a ship that’s westward bound to plow the rolling sea,
To the blessed Land of Room Enough beyond the ocean bars,
Where the air is full of sunlight and the flag is full of stars.”

Henry Van Dyke

Source: America for Me (1909), Lines 21-24.

“The world is full of warfare 'twixt the evil and the good;
I watched the battle from afar as one who understood
The shouting and confusion, the bloody, blundering fight—
How few there are that see it clear, how few that wage it right!”

Henry Van Dyke

Another Chance.

“This is the gospel of labour, ring it, ye bells of the kirk!
The Lord of Love came down from above, to live with the men who work.
This is the rose that He planted, here in the thorn-curst soil:
Heaven is blest with perfect rest, but the blessing of Earth is toil.”

Henry Van Dyke

The Toiling of Felix, Pt. III, st. 5. (1898)

“The mountain is voiceless and imperturbable; and its very loftiness and serenity sometimes make us the more lonely.”

Henry Van Dyke

Little Rivers Little Rivers http://www.gutenberg.org/dirs/etext98/ltrvs10.txt (1895)

“Religion? Yes, I know it well; I've heard its prayers and creeds,
And seen men put them all to shame with poor, half-hearted deeds.
They follow Christ, but far away; they wander and they doubt.
I'll serve him in a better way, and live his precepts out.”

Henry Van Dyke

Another Chance.

“I heard through the night
The rush and the clamour;
The pulse of the fight
Like blows of Thor's hammer;
The pattering flight
Of the leaves, and the anguished
Moan of the forest vanquished.”

Henry Van Dyke

II, st. 2.
The Fall of the Leaves (1874)

“What is Friendship? Something deep
That the heart can spend and keep:
Wealth that greatens while we give,
Praise that heartens us to live.”

Henry Van Dyke

The Talisman, st. 2 (January 21, 1914).

“Self is the only prison that can ever bind the soul.”

Henry Van Dyke

The Prison and the Angel
Undated

“Every mountain is, rightly considered, an invitation to climb.”

Henry Van Dyke

Ampersand Little Rivers http://www.gutenberg.org/dirs/etext98/ltrvs10.txt (1895)

“Oh, come as comes the morn.
Serene and strong and full of faith, America, arise,
With steady hope and mighty help to join thy brave Allies.
O dearest country of my heart, home of the high desire,
Make clean thy soul for sacrifice on Freedom’s altar-fire:
For thou must suffer, thou must fight, until the warlords cease,
And all the peoples lift their heads in liberty and peace.”

Henry Van Dyke

Liberty Enlightening the World (1917)

“Thou warden of the western gate, above Manhattan Bay,
The fogs of doubt that hid thy face are driven clean away:
Thine eyes at last look far and clear, thou liftest high thy hand
To spread the light of liberty world-wide for every land.”

Henry Van Dyke

Liberty Enlightening the World (1917)