Contemporary poetry which will, accidents apart, modify the attitudes of this reader must be such as could not have been written in another age than our own. It must have sprung in part from the contemporary situation. It must correspond to needs, impulses, attitudes, which did not arise in the same fashion for poets in the past, and criticism also must take notice of the contemporary situation. Our attitudes to man, to nature, and to the universe change with every generation, and have changed with unusual violence in recent years. We cannot leave these changes out of account in judging modern poetry. When attitudes are changing neither criticism nor poetry can remain stationary. To those who realise what the poet is this will be obvious; but all literary history bears it out. It would be of little use to give a list of the chief recent intellectual revolutions and to attempt to deduce therefrom what must be happening to poetry. The effects upon our attitudes of changes of opinion are too complex to be calculated so. What we have to consider is not men’s current opinions but their attitudes--how they feel about this or that as part of the world; what relative importance its different aspects have for them; what they are prepared to sacrifice for what; what they trust, what they are frightened by, what they desire. To discover these things we must go to the poets. Unless they are failing us, they will show us just these things. They will _show_ them, but, of course, they will not state them. Their poetry will not be _about_ their attitudes in the sense in which a treatise on anatomy is about the structure of the body. Their poetry will arise out of their attitudes and will evoke them in an adequate reader, but, as a rule, it will not mention any attitudes. We must, of course, expect occasional essays in verse upon psychological topics, but these should not mislead us. Most of the attitudes with which poetry is concerned are indescribable--because psychology is still in a primitive stage--and can only be named or spoken about as the attitude of this poem or that. The poem, the actual experience as it forms itself in the mind of the fit reader, controlling his responses to the world and ordering his impulses, is our best evidence as to how other men feel about things; and we read it, if we are serious, partly to discover how life seems to another, partly to try how his attitudes suit us, engaged as we also are in the same enterprise.