History is the long struggle of man, by the exercise of his reason, to understand his environment and to act upon it. But the modern period has broadened the struggle in a revolutionary way. Man now seeks to understand, and to act on, not only his environment, but himself; and this has added, so to speak, a new dimension to reason, and a new dimension to history. The present age is the most historically minded of all ages. Modern man is to an unprecedented degree self-conscious and therefore conscious of history. He peers eagerly back into the twilight out of which he has come in the hope that its faint beams will illuminate the obscurity into which he is going; and, conversely, his aspirations and anxieties about the path that lies ahead quicken his insight into what lies behind. Past, present and future are linked together in the endless chain of history.

What It Means

This is a placeholder explanation generated by the low-overhead model. It interprets "History is the long struggle of man, by the exercise of his reason, to understand his environment and to act upon it. But the modern period has broadened the struggle in a revolutionary way. Man now seeks to understand, and to act on, not only his environment, but himself; and this has added, so to speak, a new dimension to reason, and a new dimension to history. The present age is the most historically minded of all ages. Modern man is to an unprecedented degree self-conscious and therefore conscious of history. He peers eagerly back into the twilight out of which he has come in the hope that its faint beams will illuminate the obscurity into which he is going; and, conversely, his aspirations and anxieties about the path that lies ahead quicken his insight into what lies behind. Past, present and future are linked together in the endless chain of history." in the context of "Chap. 6 : The Widening Horizon" to mean that wisdom is timeless.