There is another great mystery of the cross which is very little understood. Everywhere without us there is space. We call space that which can accommodate, which can contain. Within us there is space too; the space within extends in another direction. It is always a puzzle for the materialist when he hears of the two worlds, this world and the other, the next world. He says, "This world I know, but the other world I do not know. Where is the other world?" Our eyes can give us an idea, a picture of the other world. These little eyes, not an inch in length, contain so many miles of country, such vast tracts, the sun, the moon, the whole cosmos, millions upon millions of miles. These are not contained in the physical eyes but in the eyes within. The space within is much vaster than the space without; it can contain hundreds and thousands of times all that is in the world without. In this meaning the cross signifies the two worlds.