The truth is that the subject matter for logic is the secondary intelligibles in so far as reflection on them leads from the known to [understanding] the unknown (or to something similar, as do reductio arguments or persuasive arguments [146] or image-evoking arguments and the like). And if they are characterised by the rider mentioned by the masters of this craft, conceptions and assents are among the set of secondary intelligibles in just the same way as definition and syllogism and their parts, like universal and particular and subject and predicate and proposition and premise and conclusion (Tûsî Ta‘dîl [1974b] 144.21–u, 145.pu–146.3).