Milton taught that if such compatibility was lacking and could not be achieved after sincere effort, all concerned should recognize the right of divorce, inasmuch as God had not joined such an ill-yoked couple. However, it is doubtful that Milton regarded his own marriage in such a light, for in 1645 he forgave a repentant Mary--she blamed her mother--and as far as is known they lived contentedly together until she died in 1652. In 1644 Milton's "Of Education" dealt with another kind of domestic freedom, how to develop in schoolboys discipline, reasonableness, broad culture, all-round ability, and independence of judgment. The same year saw Areopagitica, his defense of man's right to free speech and discussion as the best means of advancing truth. To this end he opposed prepublication censorship though admitting that if a book or those responsible for it broke clear and reasonable laws against libel, pornography, blasphemy, or sedition, the work could be repressed or those responsible for it could be fairly tried and punished if found guilty. Milton advocated neither licentiousness or avoidable interference with individuals but, rather, responsible freedom under just laws and magistrates. The divorce tracts made Milton undeservedly notorious as a fanatic libertine advocate of free love. Readers of his collected Poems (1645) were therefore probably surprised to find the charming seriousness of an author who, had he died then, might have been ranked with George Herbert and Robert Herrick as an Anglican poet. The volume contained not only the poems mentioned above but also exquisite lyrics such as "On a May Morning" and "At a Solemn Musick." Milton also put new life into the sonnet genre, investing it with wider subject matter. As the civil war drew to a close, Milton turned from defending the liberty of religion, marriage, and publication to condemning royal tyranny. The Tenure of Kings and Magistrates (1649) argued that men have a natural right to freedom and that contracts they make with rulers are voluntary and terminable. Soon after its publication he began a decade as the revolutionary government's secretary for foreign tongues: his chief duty was to put state letters into choice Latin. His next pamphlet, Eikonoklastes (1649), answered "The King's Book," a self-justification attributed to Charles I. This was followed by two Defenses of the English People (1651, 1654) to explain why they revolted and a Defense of Himself (1655) against various attackers. These works were in Latin: Milton was the revolution's chief international propagandist. For some years Milton had been losing his eyesight, and by early 1652 he was totally blind.