3. With respect to the duties of trustees, it is held, in conformity to the old law of uses, that pernancy of the profits, execution of estates, and defence of the land, are the three great properties of a trust, so that the courts of chancery will compel trustees, 1. To permit the cestui que trust to receive the rents and profits of the land. 2. To execute such conveyances, in accordance with the provisions of the trust, as the cestui que trust shall direct. 3. To defend the title of the land in any court of law or equity. Cruise, Dig. tit. 12, c. 4, s. 4.
4. It has been judiciously remarked by Mr. Justice Story, 2 Eq. Jur. §1267, that in a great variety of cases, it is not easy to say what the duty of a trustee is; and that therefore, it often becomes indispensable for him, before he acts, to seek, the aid and direction of a court of equity. Fonbl. Eq. book 2, c. 7, §2, and note c. Vide Vin. Ab. tit. Trusts, O, P, Q, R, S, T; Bouv. Inst. Index, h. t.