Who forms the phalanx, and who points the way?

III. God in the nature of each being founds
Its proper bliss, and sets its proper bounds:
But as He framed a whole, the whole to bless,
On mutual wants built mutual happiness:
So from the first, eternal order ran,
And creature linked to creature, man to man.
Whate'er of life all-quickening ether keeps,
Or breathes through air, or shoots beneath the deeps,
Or pours profuse on earth, one nature feeds
The vital flame, and swells the genial seeds.
Not man alone, but all that roam the wood,
Or wing the sky, or roll along the flood,
Each loves itself, but not itself alone,
Each sex desires alike, till two are one.
Nor ends the pleasure with the fierce embrace;
They love themselves, a third time, in their race.
Thus beast and bird their common charge attend,
The mothers nurse it, and the sires defend;
The young dismissed to wander earth or air,
There stops the instinct, and there ends the care;
The link dissolves, each seeks a fresh embrace,
Another love succeeds, another race.
A longer care man's helpless kind demands;
That longer care contracts more lasting bands:
Reflection, reason, still the ties improve,
At once extend the interest and the love;
With choice we fix, with sympathy we burn;
Each virtue in each passion takes its turn;