Go, teach Eternal Wisdom how to rule --
Then drop into thyself, and be a fool!
Superior beings, when of late they saw
A mortal man unfold all Nature's law,
Admired such wisdom in an earthly shape
And showed a Newton as we show an ape.
Could he, whose rules the rapid comet bind,
Describe or fix one movement of his mind?
Who saw its fires here rise, and there descend,
Explain his own beginning, or his end?
Alas, what wonder! man's superior part
Unchecked may rise, and climb from art to art;
But when his own great work is but begun,
What reason weaves, by passion is undone.
Trace Science, then, with Modesty thy guide;
First strip off all her equipage of pride;
Deduct what is but vanity or dress,
Or learning's luxury, or idleness;
Or tricks to show the stretch of human brain,
Mere curious pleasure, or ingenious pain;
Expunge the whole, or lop th' excrescent parts
Of all our vices have created arts;
Then see how little the remaining sum,
Which served the past, and must the times to come!
II. Two principles in human nature reign;
Self-love to urge, and reason, to restrain;
Nor this a good, nor that a bad we call,
Each works its end, to move or govern all
And to their proper operation still,
Ascribe all good; to their improper, ill.
Self-love, the spring of motion, acts the soul;
Reason's comparing balance rules the whole.
Man, but for that, no action could attend,
And but for this, were active to no end:
Fixed like a plant on his peculiar spot,
To draw nutrition, propagate, and rot;
Or, meteor-like, flame lawless through the void,
Destroying others, by himself destroyed.
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