 Note that an assent is not merely the production of a proposition by tying a subject and predicate together; “Assent, however, occurs when there takes place in the mind a relating of this form to the things themselves as being in accordance with them.” All knowledge, according to Avicenna, is either conception or assent. Conception is produced by definition, assent by proof. All Avicennan treatises on logic are structured in accordance with this doctrine: a first section deals with definition, which conduces to conception, a second with proof, which conduces to assent.