In 1648, the House of Commons abolished the monarchy and in 1649 the House of Lords. Also in 1649 it declared that England "should thenceforth be governed as a commonwealth and free state by the supreme authority of this nation, the representatives of the people in Parliament." It made a new constitution.
John Milton defended the Commonwealth as superior to the monarchy because it could not deteriorate into tyranny in his books: "First Defense of the People of England" in 1651, and "Second Defense" in 1654. He lauded Cromwell as great in war and great in peace, and exemplifying the principle that "nature appoints that wise men should govern fools".
Thomas Hobbes, the son of a clergyman, and tutor to students, wrote "Leviathan" in 1651 on his theory of sovereignty. Hobbes thought that states are formed as the only alternative to anarchy, barbarism, and war, so that supremacy and unity of a sovereign power is essential to a civilized life and the protection of the citizenry. A sovereign may be a man or body of men as long as his or its authority is generally recognized. There must be a social contract among the citizenry to obey a certain sovereign. To avoid religious conflict, there must be a complete subordination of the church to the state and the religion of a state must be dependent upon its secular sovereign. Hobbes thought that knowledge of the world came through experience and not reason alone. Only matter exists, and everything that happens can be predicted in accordance with exact, scientific laws. He regarded human societies as purely mechanical systems set in motion by human desires. He saw self interest as the mainspring of moral law. Conflicting self interests transformed into a lawful system of agreements. Hobbes opined that all power really originated in the people and that the end of all power was for the people's good.
On the other hand, James Harrington, who wrote "The Commonwealth of Oceana" in 1656, opined that a stable society depended on a direct relationship between the distribution of property and political power; no one with property worth more than 2,000 pounds should be allowed to acquire more and property should be divided among children. A senate of mature property owners were to make and debate the laws while an assembly elected by universal suffrage was to vote on them because "a popular assembly without a senate cannot be wise and a senate without a popular assembly will not be honest". A third of the Senate would turn over every year. John Milton defended the execution of the King in "The Tenure of Kings and Magistrates" in which he maintained that the people may "as often as they shall judge it for the best either to choose him or reject him or depose him, though no tyrant, merely by the liberty and right of freeborn men to be governed as seems to the best". He also wrote in favor of liberty of the press. Ordinary speech found its way into prose writing.
Lands of more than 700 Royalists, including church lands, were confiscated and sold or leased by county committees. Many Royalists put their lands into trusts or turned them over to relatives or sold them outright to prevent confiscation. It was an upheaval comparable to the dissolution of the monasteries. Also, specified Papists who had taken up arms against the realm lost their lands, goods, money, rents, and two-thirds of their personal estates. But allowance was made for the maintenance of their wives and children.
The Book of Common Prayer was abolished because of its burdensome ceremonies. It was replaced by a Directory for Public Worship. According to this, the Sunday service was to include reading of the Scriptures, prayer, and a sermon, ordinarily on some text of scripture which would be explained with reasons therefore and applied to peoples' lives so they could see it they had sinned or not. The ending of episcopal patronage gave some parishes the right to elect their own ministers.
All festivals and holy days were abolished, e.g. Christmas, Easter, Whitsuntide. Instead, scholars, apprentices, and servants were to have recreation and stores were to be closed every second Tuesday of the month. The usual merry-making, music, dancing, and sports after the Sunday service were discontinued.
A day for fasting: the last Wednesday of every month, was declared by statute. This day was to be "kept with the more solemn humiliation, because it may call to remembrance our sins, and the sins of our forefathers, who have turned this Feast, pretending the memory of Christ into an extreme forgetfulness of him, by giving liberty to carnal and sensual delights, being contrary to the life which Christ himself led here upon earth, ...". This statute lasted for only five years from 1644 because observance of it was not consistent throughout the country.
Educational opportunities such as in grammar schools were more widespread and stronger than ever before or since until the 1800s. About 78% of men in London were literate, and 30% of men nationwide. About half the women in London were literate by 1700.
In 1645, the marshalls of the admiralty and five major ports were ordered to search all ships for stolen children since it had been a problem in London.