stylistic:tone
Proprietary estoppel

The fact that the constructive trust remains predominantly remedial does not, however, mean that it represents a medium for the indulgence of idiosyncratic notions of fairness and justice. As an equitable remedy, it is available only when warranted by established equitable principles or by the legitimate processes of legal reasoning, by analogy, induction and deduction, starting from the conceptual foundations of such principles... Under the law of the land... proprietary rights fall to be governed by principles of law and not by some mix of judicial discretion, subjective views about which party 'ought to win'... and the 'formless void' of individual moral opinion.