who was the original leader of the puritans in the colonies and what was his famous quote
John Winthrop. His quote was "bear one another's burdens".
John Winthrop
He encouraged the colonists to "bear one another's burdens" and to view themselves as a "Company of Christ, bound together by Love." 
wiki:5301796
John Winthrop [SEP] "A Model of Christian Charity"
John Winthrop wrote and delivered the lay sermon that became "A Model of Christian Charity" either before the 1630 crossing to North America or while en route. It described the ideas and plans to keep the Puritan society strong in faith, as well as the struggles that they would have to overcome in the New World. He used the phrase "city upon a hill" (derived from the Bible's Sermon on the Mount) to characterize the colonists' endeavour as part of a special pact with God to create a holy community. He encouraged the colonists to "bear one another's burdens" and to view themselves as a "Company of Christ, bound together by Love." He told the colonists to be stricter in their religious conformance than even the Church of England, and to make it their objective to establish a model state.