The speaker's attitude in this passage makes it clear that

the attitude of the speaker in the passage makes it distinctly clear that he values freedom more than being tied down by owning a farm.

Explanation:

Henry David Thoreau has been always open mouth about owning a farm, but in the conclusive end when he gets down deeper, it has been evident that he always appreciated spirit more than anything.

thereby, it has been in his attitude to value freedom much more than any desirable materialistic things. owning a farm was such materialistic thing for him. And thereby, he says that tying down with being a farm owner is much less than being the free spirit and valuing freedom of the free spirit.