Thoreau is a vigorous soul and I found it refreshing that he associates vigour with connected thought.  As you see from the second quotation below, thinking a thought about life and getting it expressed is a Herculean labour.

‘No exercise implies more real manhood and vigor than joining thought to thought.  How few men can tell what they have thought!’

‘You conquer fate by thought.  If you think the fatal thought of men and institutions, you need never pull the trigger.  The consequences of thinking inevitably follow.  There is no more Herculean task than to think a thought about this life and then get it expressed.’   6 May 1858

Source: Henry David Thoreau, The Journal 1837-1861, Damion Searls (ed.), preface by John R. Stilgoe (New York: New York Review Books, 2009), p. 494-95

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