Known.

The more we have known of the really good things, the more insipid the thin lemonade of later literature becomes, sometimes almost to the point of making us sick. Do you know a work of literature written in the last, say, fifteen years that you think has any lasting quality? I don't. It is partly idle chatter, partly propaganda, partly self-pitying sentimentality, but there is no insight, no ideas, no clarity, no substance and almost always the language is bad and constrained. On this subject I am quite consciously a laudator temporis acti.

Dietrich Bonhoeffer, from Letters and Papers from Prison