The motive of science was the extension of man, on all sides, into Nature, till his hands should touch the stars.
Emerson presents science as an effort to extend human understanding and capability into the natural world. The image of a person whose “hands should touch the stars” is metaphorical, expressing the ambition to investigate realms far beyond ordinary human reach. Scientific inquiry, in this account, allows people to enlarge what they can observe, understand and act upon.
Within Beauty, the statement forms part of Emerson’s broader attempt to connect science, nature and human experience. He treats scientific discovery not simply as the accumulation of detached facts but as a way of deepening humanity’s relationship with the world. The quotation reflects a 19th-century philosophical view of science as an expansive intellectual enterprise. It does not describe a formal scientific method; rather, it characterises the underlying impulse to overcome limits of perception and bring increasingly distant parts of nature within human understanding.