Such faith is indeed profoundly human and has accompanied the mind in all its gropings and discoveries; preference being the primary principle of discrimination and attention. Reason in her earliest manifestations already discovered her affinities and incapacities, and loaded the ideas she framed with friendliness or hostility. It is not strange that her latest constructions should inherit this relation to the will; and we shall see that the moral tone and affinity of metaphysical systems corresponds exactly with the primary function belonging to that type of idea on which they are based. Idealistic systems, still cultivating concretions in discourse, study the first conditions of knowledge and the last interests of life; materialistic systems, still emphasising concretions in existence, describe causal relations, and the habits of nature. Thus the spiritual value of various philosophies rests in the last instance on the kind of good which originally attached the mind to that habit and plane of ideation. [Sidenote: Concretions in discourse express instinctive reactions.] We have said that perceptions must be recognised before they can be associated by contiguity, and that consequently the fusion of temporally diffused experiences must precede their local fusion into material objects. It might be urged in opposition to this statement that concrete objects can be recognised in practice before their general qualities have been distinguished in discourse. Recognition may be instinctive, that is, based on the repetition of a felt reaction or emotion, rather than on any memory of a former occasion on which the same perception occurred. Such an objection seems to be well grounded, for it is instinctive adjustments and suggested action that give cognitive value to sensation and endow it with that transitive force which makes it consciously representative of what is past, future, or absent. If practical instinct did not stretch what is given into what is meant, reason could never recognise the datum for a copy of an ideal object. [Sidenote: Idealism rudimentary.]