Read it through once

'Tis best sometimes your censure to restrain, And charitably let the dull be vain Your silence there is better than your spite, For who can rail so long as they can write? Still humming on, their drowsy course they keep, And lashed so long like tops are lashed asleep. False steps but help them to renew the race, As after stumbling, jades will mend their pace. What crowds of these, impenitently bold, In sounds and jingling syllables grown old, Still run on poets in a raging vein, Even to the dregs and squeezing of the brain; Strain out the last dull droppings of their sense, And rhyme with all the rage of impotence!