Pleasure's for use; it differs in degree,
Proportion'd to the thing's necessity.
Hence various objects variously excite,
And diff'rent is the date of each delight;
But when th' allotted end we once attain,
Each step beyond it, is a step to pain.
Nor let us murmur. — Hath not earth a store
For ev'ry want? it was not meant for more.