When a law is in its nature a contract, and absolute rights have vested under that contract, a repeal of the law cannot divest those rights, nor annihilate or impair a title acquired under the law. A grant is a contract according to the meaning given to the word by jurists. A grant is a contract executed, and a party is always estopped by his own grant. A party cannot pronounce his own act or deed invalid, whatever cause may be assigned for its invalidity, and though that party be the legislature of a state. A grant amounts to an extinguishment of the right of the grantor, and implies a contract not to reassert that right. A grant from a state should be as much protected as a grant from one individual to another; therefore, a state is as much inhibited from impairing its own contracts, or a contract to which it is a party, as it is from impairing the obligation of contracts between two individuals. A grant once made by the ruling or competent power, creates an indefeasible and irrevocable title. There is no authority or principle which could support the doctrine that such a grant was revocable in its own nature, and held only _durante bene placito_. For no ruling power, be it kingly, legislative, or otherwise, can repeal a law or grant creating a corporate body, or confirming to them property already acquired under the faith of previous laws or edicts, and by such repeal vest the property in others without the consent or default of the corporators. Such a procedure would be repugnant to the principles of natural justice. A society or order of religious people holding property in common or _in solido_, may be considered in the character of a private eleemosynary institution endowed with a capacity to take property for objects unconnected with government: it receives gifts or devises, and other private donations bestowed by individuals on the faith of its perpetuity and usefulness--such a corporation not being invested with any political power whatever, or partaking in any degree in the administration of civil government. It is merely an institution or private corporation for general charity. It is established under a charter, which was a contract, to which the donors, the trustees of the corporation, and the governing power were the original parties, and it was granted for a valuable consideration--for the security and disposition of the property necessary for the existence of the community, order, or society.