But none of these actions relieves the trustee of restrictions placed on trust funds by the settlor. Bertram v. Berger, 1 Ill.App.3d 743, 274 N.E.2d 667, 670 (1971); Pennsylvania Co. for Insurances v. Contributors to Pennsylvania Hospital, 63 R.I. 466, 9 A.2d 269, 273 (1939); Bogert, Trusts Trustees § 393 at 235-242 (rev. 2d ed. 1977). Similarly, a trustee is not relieved of his obligations when they are voluntarily assumed and performed by another.