"To be in company ...."

To be in company, even with the best, is soon wearisome and dissipating. I love to be alone. I never found the companion that was so companionable as solitude.

Henry David Thoreau

"We need the tonic of wildness ...."

We need the tonic of wildness ... At the same time that we are earnest to explore and learn all things, we require that all things be mysterious and unexplorable, that land and sea be indefinitely wild, unsurveyed and unfathomed by us because unfathomable. We can never have enough of nature.

--> Henry David Thoreau

"If a man does not keep pace ...."

Grey-cheeked Bulbul 

Yellow-bellied Bulbul

Hairy-backed Bulbul

If a man does not keep pace with his companions, perhaps it is because he hears a different drummer. Let him step to the music which he hears, however measured or far away.     

--> Henry David Thoreau

"Heaven is under our feet ...."

Heaven is under our feet as well as over our heads.

--> Henry David Thoreau

"I believe that there is a subtle magnetism ...."

I believe that there is a subtle magnetism in Nature, which, if we unconsciously yield to it, will direct us aright.

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Henry David Thoreau