Section 4 tells how "many a captain" struggled to reach India. History seems like an underground stream which now and again rises to the surface. Thus Whitman praises Vasco da Gama, who discovered the sea route to India, and who thus accomplished the "purpose vast," the "rondure [rounding] of the world."
This is a tribute to the courage and adventurous spirit of the West in seeking a passage to India. The poet has a vision of history "as a rivulet running," and this dominates his sense of space. History is conceived of as a progression of continuous events which are like a flowing stream. This stream joins the spiritual sea and the poet's vision endows historical happenings with spiritual meaning.
Section 5 presents the spectacle of this earth "swimming in space," endowed with incredible beauty and power. Since the days of Adam and Eve, Whitman says, man has asked the meaning of life: "Who shall soothe these feverish children?/ . . . Who speak the secret of impassive earth?' After the scientists and explorers have achieved their goals, the poet, who is "the true son of God," will forge the links of spiritual union. "Trinitas divine" will be achieved through the visionary power of the poet; he will fuse "Nature and Man."
The earth has been spanned by the efforts of engineers and technicians, Whitman says, and now it is for the poet to bring about the unity of East and West in the realm of the spirit. In his general survey of history, Whitman seems to encompass all time. The poet is the "true son of God" because, in visualizing the union of man and nature, he responds to the divine call within him. He is thus a true explorer and a discoverer of spiritual India.
