Reference: These lines are from Walt Whitman's poem 'A noiseless, patient spider'.
Context: The lines express the content of the search by the soul. The soul seeks a link.
Explanation: The soul is in search of eternity. It tries to link the mortal body to immortality. It needs to bridge-the bridge of death. Till it meets the link, it will keep on it search with the ductile, gossamer thread.
Comment: The soul is bridge that draws man to God, the Eternity.