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 stand in awe of my body.

He who is only a traveler learns things at second-hand and by the halves, and is poor authority. We are most interested when science reports what those men already know practically or instinctively, for that alone is a true humanity, or account of human experience.

To him whose elastic and vigorous thought keeps pace with the sun, the day is a perpetual morning. It matters not what the clocks say or the attitudes and labors of men. Morning is when I am awake and there is a dawn in me.

It is better to have your head in the clouds, and know where you are... than to breathe the clearer atmosphere below them, and think that you are in paradise.

To some extent, mythology is only the most ancient history and biography. So far from being false or fabulous in the common sense,it contains only enduring and essential truth, the I and you, the here and there, the now and then, being omitted. Either time or rare wisdom writes it.

Measure your health by your sympathy with morning and spring. If there is no response in you to the awakening of nature -if the prospect of an early morning walk does not banish sleep, if the warble of the first bluebird does not thrill you -know that the morning and spring of your life are past. Thus may you feel your pulse.