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.
Most strength the moving principle requires;
Active its task, it prompts, impels, inspires.
Sedate and quiet the comparing lies,
Formed but to check, deliberate, and advise.
Self-love still stronger, as its objects nigh;
Reason's at distance, and in prospect lie:
That sees immediate good by present sense;
Reason, the future and the consequence.
Thicker than arguments, temptations throng.