Meggary VC stated in Cowan v Scargill  Ch 270:
The starting point is the duty of trustees to exercise their powers in the best interests of the present and future beneficiaries of the trust, holding the scales impartially between different classes of beneficiaries. This duty of the trustees towards their beneficiaries is paramount. They must, of course, obey the law; but subject to that, they must put the interests of their beneficiaries first. When the purpose of the trust is to provide financial benefits for the beneficiaries, as is usually the case, the best interests of the beneficiaries are normally their best financial interests.
The High Court of Australia stated in Finch v Telstra Super Pty Ltd  HCA 36; (2010) 242 CLR 254; (2010) 271 ALR 236; (2010) 84 ALJR 726 at :.
“Because of the potentially lengthy time periods over which superannuation savings are accumulated, it was natural, and it is now in many instances mandatory, for a trust mechanism to be employed. These funds have increasingly come under detailed statutory regulation. The government considers that the taxation advantages of superannuation should not be enjoyed unless superannuation funds are operating efficiently and lawfully.”