This section is from the book "Popular Law Library Vol7 Equity Jurisprudence, Trusts, Equity Pleading", by Albert H. Putney. Also available from Amazon: Popular Law-Dictionary.
In this maxim is found one of the most fundamental characteristics of equity jurisprudence. Equity was created to supplement the common law, and for this purpose only. The result is that equity is bound by the established principles of law. It might be said that equity is addition and not subtraction. Equity was permitted to add to the law, to recognize new rights and titles, and to create new remedies, but not to disregard or destroy existing legal principles.
1 Amer. & Eng. Ency. of Law, Vol. XI, p. 157.
The accuracy of this maxim has recently been generally criticised,2 but viewed from the proper standpoint it will be seen to be correct.
Under this maxim equity is bound by the rules of evidence fixed by the law, and by the statutes of limitations.3