Doubting with Dirleton, and resolving those doubts with Stewart. Doubting and answering those doubts, but doubting still. It applies to law, science, religion, morals, etc. Sir John Nisbett of Dirleton's Doubts on points of law, and Sir James Stewart's Doubts Resolved, are works of established reputation in Scotland, but the Doubts hold a higher place than the Solutions.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894