(1) by presentation, as objects of sense

(2) by likeness, as the idea of Socrates from his picture

(3) by analogy, that is, by increase or decrease, as ideas of giants
and pigmies from men, or as the notion of the centre of the earth,
which is reached by the consideration of smaller spheres.

(4) by transposition, as the idea of men with eyes in their breasts.

(5) by composition, as the idea of a Centaur.

(6) by opposition, as the idea of death from that of life.

(7) by a kind of transition, as the meaning of words and the idea of
place.

(8)by nature, as the notion of the just and the good

(9)by privation, as handless

The Stoics resembled Locke again in endeavoring to give such a
definition of knowledge as should cover at once the reports of the
senses and the relation between ideas. Knowledge was defined by them
as a sure comprehension or a habit in the acceptance of phantasies
which was not liable to be changed by reason. On a first hearing
these definitions might seem limited to sense knowledge but if we
bethink ourselves of the wider meanings of comprehension and of
phantasy, we see that the definitions apply as they were meant to
apply to the mind's grasp upon the force of a demonstration no less