Sentence:  In our Athenian constitution, if we are weakly governed or capriciously, which hardly can happen, the mischief is transitory and reparable; one year closes it; and the people, both for its satisfaction and its admonition, sees that no corruption, no transgression, in its magistrates, is unregarded or unchastized. This, of all advantages, is the greatest, the most corroborative of power, the most <WSD>tutelary</WSD> of morals. 
Meaning of the word marked with <WSD> tags:  Relating to guardianship or protection.