equity aids the vigilant and diligent

A maxim of equity, sometimes stated as "equity aids the vigilant, not the sluggards." The Latin form is aequitas subvenit vigilantibus non dormientibus. In application, the maxim is essentially the equivalent of the doctrine of estoppel. Equity will not take rights acquired by one who has been vigilant and give their benefit to one who has lost them through inaction. 27 Am J2d Eq § 130.