From Walden; or, Life in the Woods:
"I went to the woods because I wished to live deliberately, to front only the essential facts of life, and see if I could not learn what it had to teach, and not, when I came to die, discover that I had not lived."
From his poem, "Sic Vita":
I am a parcel of vain strivings tied
By a chance bond together,
Dangling this way and that, their links
Were made so loose and wide,
For milder weather.
"Sic Vita" means "Such Life" - it probably derives from the Latin Sic vita est, "such is life". This is one crazy form he's using, and I confess to having written a poem using it myself: it's a hodgepodge of iambic lines, rhymed ABCACB. (Number of iambic feet per line: 5-3-4-3-1-2.)
I especially love the first few words: "I am a parcel of vain strivings". *swoon*