Assent to the propositions understood.

". . . When he [Thomas Manton] says that 'true believing is not an act of the understanding only, but a work of all the heart,' he is not accurately confronting 'the former age.' The former age never said that true believing or false believing either, is an act of the understsnding only. The former age and much of the latter ages too specify assent in addition to understanding. They make this specification with the deliberate aim of not restricting belief to understanding alone. One can understand and lecture on the philosophy of Spinoza; but this does not mean that the lecturer assents to it. Belief is an act of assenting to something understood. But understsnding alone is not belief in what is understood." - Gordon H. Clark, What is saving faith?