Please explain the following quote from Thoreau's "Walden" -- "live deep and suck out all the marrow of life."

If you read
the paragraph the quote was taken from, it's all there:

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. I did not wish to live what was not life, living is so dear; nor did I wish to
practise resignation, unless it was quite necessary. I wanted to live deep and suck out all the
marrow of life, to live so sturdily and Spartan-like as to put to rout all that was not life, to
cut a broad swath and shave close, to drive life into a corner, and reduce it to its lowest
terms, and, if it proved to be mean, why then to get the whole and genuine meanness of it, and
publish its meanness to the world; or if it were sublime, to know it by experience, and be able
to give a true account of it in my next excursion. For most men, it appears to me, are in a
strange uncertainty about it, whether it is of the devil or of God, and have somewhat hastily
concluded that it is the chief end of man here to "glorify God and enjoy him
forever."

Thoreau went into the woods to live a bare, spare,
and essential existence... no modern conveniences to help him make things easier, no creature
comforts to lighten his load. He went into the woods to learn what it meant to really live this
life as it is, free of all the man-made accouterments that take the life out of life. Put in a
more modern way, Thoreau wanted to live without the remote control.

His idea
was that all the things we have concocted to make life easier for us to live, at the same time
take the substance out of living, the morrow out of the bones. If you turn on the water spigot
and water comes pouring out, you don't have to pump it yourself. But it is in the very act of
pumping the water yourself, that you feel the weight and substance of the water. In your hands,
in your arms.

If things got tough for him, so be it; experience the
toughness. If winter winds chilled him to the bone, so be it; feel the cold... know it from
within. Thoreau went alone into the woods to learn how to live the way his maker intended to
live.