Seven-year commissions for justices of the peace
Official text rightpowerlimitif conditionlegal term
In order that the people may not suffer from the long continuance in place of any justice of the peace, who shall fail of discharging the important duties of his office with ability or fidelity, all commissions of justices of the peace shall expire and become void, in the term of seven years from their respective dates; and upon the expiration of any commission, the same may, if necessary, be renewed, or another person appointed, as shall most conduce to the well-being of the commonwealth.
Note (Massachusetts Legislature): [See Amendments, Art. XXXVII.]
Simplified explanation
So the people do not suffer from justices of the peace who fail in their duties staying long in place, all their commissions expire and become void seven years from their dates; an expired commission may be renewed, or another person appointed, as best serves the commonwealth.