A maxim is a conclusion upon observation of matters of fact, and is merely speculative; a "principle" carries knowledge within itself, and is prospective.
Samuel Taylor ColeridgeSwans sing before they die - 'twere no bad thing should certain persons die before they sing.
Samuel Taylor ColeridgeAs it must not, so genius cannot be lawless; for it is even that constitutes its genius - the power of acting creatively under laws of its own origination.
Samuel Taylor Coleridge