In the authorities there are to be found conflicting views on the question whether the obligation cast upon the mortgagee is simply that he should act "in good faith" (which means, in my opinion, in the language used in most of the authorities, that he should act without fraud and without wilfully or recklessly sacrificing the interests of the mortgagor) or is an obligation which is broken also if there is negligence in carrying out the sale. Support for the former view may be found in the statements in Kennedy v. De Trafford [5] by Lindley L.J. and in the same case on appeal, [6] by Lord Herschell, in the adoption of those statements by this Court in Barns v. Queensland National Bank Ltd. [7] and in Pendlebury v. Colonial Mutual Life Assurance Society Ltd. [8] and in the definite opinion expressed by Isaacs J. in the latter case, that the mortgagee is not answerable for "mere negligence or carelessness". On the other hand, it appears that the view that negligence is enough to make the mortgagee liable to account to the mortgagor for loss arising from a sale is supported, not only by the recent cases of Holohan v. Friends Provident and Century Life Office [9] and Cuckmere Brick Co. Ltd. v. Mutual Finance Ltd. [10] , but also by the decision of the Privy Council in McHugh v. Union Bank of Canada [11] . But I do not think it necessary to resolve this question in this appeal.
Mason J. said [12] :
It will be seen that the conclusion which I reach is that A.S.L. was in breach of its duty to the mortgagors in that it exercised its power of sale without taking reasonable steps to obtain a proper price and in so doing acted otherwise than bona fide, that is, recklessly, not caring whether the price obtained was in the circumstances a proper price or not. Accordingly, I need not consider the vexed question whether the mortgagee's duty is merely to act bona fide or whether, in addition, he is bound to take reasonable precautions to obtain a proper price. The conflicting authorities have recently been reviewed by the Court of Appeal in Cuckmere Brick Co. v. Mutual Finance Ltd. [13] : see also Holohan v. Friends Provident and Century Life Office [14] . It was held in these cases that the mortgagee is bound to act bona fide and take reasonable precautions to obtain a proper price, or, as Salmon L.J. would prefer to express it, "the true market value". In any resolution of the question in this Court account must be taken of what was said in Barns v. Queensland National Bank Ltd. [15] and Pendlebury v. Colonial Mutual Life Assurance Society Ltd. [16] . However, as I have said, on the view which I take of the facts this problem does not arise for decision; nor is it necessary for me to determine the related question whether a mere failure to take reasonable precautions to obtain a proper price is a sufficient ground for setting aside a mortgagee's contract of sale or for restraining its performance (see Property & Bloodstock Ltd. v. Emerton [17] ).
Menzies J., who dissented in the application of the principle to the facts, expressed the general rule as follows [18] :
The rule to be applied here is not in doubt; it was stated authoritatively by Lord Herschell in the last century. In Kennedy v. De Trafford [19] which has been followed by this Court in Barns v. Queensland National Bank Ltd. [20] and Pendlebury v. Colonial Mutual Life Assurance Society Ltd. [21] , the Lord Chancellor said [22] : " if a mortgagee in exercising his power of sale exercises it in good faith, without any intention of dealing unfairly by his mortgagor, it would be very difficult indeed, if not impossible, to establish that he had been guilty of any breach of duty towards the mortgagor. Lindley L.J. in the Court below, says that "it is not right or proper or legal for him either fraudulently or wilfully or recklessly to sacrifice the property of the mortgagor." Well, I think that is all covered really by his exercising the power committed to him in good faith. It is very difficult to define exhaustively all that would be included in the words "good faith", but I think it would be unreasonable to require the mortgagee to do more than exercise his power of sale in that fashion. Of course, if he wilfully and recklessly deals with the property in such a manner that the interests of the mortgagor are sacrificed, I should say that he had not been exercising his power of sale in good faith."