He published, about the same time, his Areopagitica, a speech of Mr. John Milton, for the liberty of unlicensed printing. The danger of such unbounded liberty, and the danger of bounding it, have produced a problem in the science of government, which human understanding seems, hitherto, unable to solve. If nothing may be published but what civil authority shall have previously approved, power must always be the standard of truth; if every dreamer of innovations may propagate his projects, there can be no settlement; if every murmurer at government may diffuse discontent, there can be no peace; and if every skeptick in theology may teach his follies, there can be no religion. The remedy against these evils is to punish the authors; for it is yet allowed that every society may punish, though not prevent, the publication of opinions which that society shall think pernicious; but this punishment, though it may crush the author, promotes the book; and it seems not more reasonable to leave the right of printing unrestrained, because writers may be afterwards censured, than it would be to sleep with doors unbolted, because by our laws we can hang a thief.
But whatever were his engagements, civil or domestick, poetry was never long out of his thoughts. About this time (1645) a collection of his Latin and English poems appeared, in which the Allegro and Penseroso, with some others, were first published.
He had taken a large house in Barbican, for the reception of scholars; but the numerous relations of his wife, to whom he generously granted refuge for awhile, occupied his rooms. In time, however, they went away; "and the house again," says Philips, "now looked like a house of the muses only, though the accession of scholars was not great. Possibly his having proceeded so far in the education of youth may have been the occasion of his adversaries calling him pedagogue and schoolmaster; whereas, it is well known he never set up for a publick school, to teach all the young fry of a parish; but only was willing to impart his learning and knowledge to his relations, and the sons of gentlemen who were his intimate friends, and that neither his writings, nor his way of teaching, ever savoured in the least of pedantry."