In 1848, Thoreau went to jail for refusing, as a protest against the Mexican war, to pay his poll tax. When RW Emerson came to bail him out, Emerson said, 'Henry, what are you doing in there?' Thoreau quietly replied, 'Ralph, what are you doing out there?'

I had often stood on the banks of the Concord, watching the lapse of the current, an emblem of all progress, following the same law with the system, with time, and all that is madeand at last I resolved to launch myself on its bosom and float whither it would bear me.

In dreams we see ourselves naked and acting out our real characters, even more clearly than we see others awake.

I lingered most about the fireplace, as the most vital part of the house.

Let go of the past and go for the future.

It is not that we love to be alone, but that we love to soar, and when we do soar, the company grows thinner and thinner until there is none at all. …We are not the less to aim at the summits though the multitude does not ascend them.

The poet uses the results of science and philosophy, and generalizes their widest deductions.