Several vessels, following the tract of the ocean, have sailed entirely round the world, as a man may march in a circle, and come round by the contrary side of the circle to the spot he set out from.

The circular dimensions of our world, in the widest part, as a man would measure the widest round of an apple, or a ball, is only twenty-five thousand and twenty English miles, reckoning sixty-nine miles and an half to an equatorial degree, and may be sailed round in the space of about three years.

[NOTE by Paine: Allowing a ship to sail, on an average, three miles in an hour, she would sail entirely round the world in less than one year, if she could sail in a direct circle, but she is obliged to follow the course of the ocean .-- Author.] A world of this extent may, at first thought, appear to us to be great; but if we compare it with the immensity of space in which it is suspended, like a bubble or a balloon in the air, it is infinitely less in proportion than the smallest grain of sand is to the size of the world, or the finest particle of dew to the whole ocean, and is therefore but small; and, as will be hereafter shown, is only one of a system of worlds, of which the universal creation is composed.
It is not difficult to gain some faint idea of the immensity of space in which this and all the other worlds are suspended, if we follow a progression of ideas.

When we think of the size or dimensions of, a room, our ideas limit themselves to the walls, and there they stop.
But when our eye, or our imagination darts into space, that is, when it looks upward into what we call the open air, we cannot conceive any walls or boundaries it can have; and if for the sake of resting our ideas we suppose a boundary, the question immediately renews itself, and asks, what is beyond that boundary?
and in the same manner, what beyond the next boundary?
and so on till the fatigued imagination returns and says, there is no end.

Certainly, then, the Creator was not pent for room when he made this world no larger than it is; and we have to seek the reason in something else.
If we take a survey of our own world, or rather of this, of which the Creator has given us the use as our portion in the immense system of creation, we find every part of it, the earth, the waters, and the air that surround it, filled, and as it were crowded with life, down from the largest animals that we know of to the smallest insects the naked eye can behold, and from thence to others still smaller, and totally invisible without the assistance of the microscope.