Thoreau's statement includes two main premises and one logical conclusion.
This type of logic implies going from premises or statements to a conclusion. For example, If birds have wings and feathers and the chicken has wings and feathers, then, the chicken is a bird.
Thoreau's statement is "If one advances confidently in the direction of his dreams, and endeavors to live the life which he has imagined, he will meet with a success unexpected in common hours".
In this statement, the premises are:
On the other hand, the conclusion is "he will meet with a success unexpected..."
Note: This question is incomplete because the name of the text it refers to is not given; due to this, I answered this question based on general knowledge.
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