I am no more lonely than the loon in the pond that laughs so loud, or than Walden Pond itself. I am no more lonely than a single mullein or dandelion in a pasture, or a bean leaf, or a housefly, or a bumblebee. I am no more lonely than the Mill Brook, or a weathercock, or the north star, or the south wind, or an April shower, or a January thaw, or the first spider in a new house.
In my walks I would fain return to my senses. What business have I in the woods, if I am thinking of something out of the woods?
Methinks that the moment my legs begin to move, my thoughts begin to flow.
Truth is the daughter of time, not of authority.
In every systematic inquiry where there are first principles, or causes, or elements, knowledge and science result from acquiring knowledge of these.
A very great deal more truth can become known than can be proven.