Why was Massachusetts Bay Colony founded?

The Massachusetts Bay colony was started by Puritans leaving their home country of England and immigrating to the American continent to practice their religious beliefs without interference from the Church of England and the British Monarchy. Puritans broke from the church in dissent over the integration of the church with the British government. The King of England headed both government and church. Puritans believed the church was wavering in its doctrine and was incorporating secular practices under the guise of religious ideology.
The result of the hard work of the Puritans in establishing a viable colony encouraged others to come to join with them. The dynamic growth created new commercial opportunities that investors were eager to participate in. The structure of the governance of the Massachusetts Bay Colony provided stability and encouraged a further increase in the colony. As the settlement expanded in population, economic growth, and reputation, so did the commitment to progressive ideas spun from the Puritan religious practice of charity.
One of the ideas was the start of an education system. Many of the Puritans that arrived in the colony were well educated by the standards of the time. They wanted to ensure future generations had the same emphasis and opportunity to attend an educational institution. Some of the premier institutions we have in modern times (for example, Harvard) were Puritan founded and sponsored.
In summary, the Massachusetts Bay Colony was founded for religious and political freedom, economic investment, and the promotion of education.