I can't understand what it means.
I think this chapter represents the type of profound change that may be required of us on our own spiritual journeys.
The generation born in the wilderness has not yet been circumcised. This ritual is symbolic of their commitment to something greater than their individual lives. The community as a whole is now accomplished. It's true for each of us as well that stepping forward to become conscious creators of our own spiritual lives may be painful at first. That one step, however, affirms our unity with all the spiritual energy expressing in the world.
Assuming tangible support of the divine—represented by the manna that has fed the Israelites through the wilderness—now ceases because it is no longer necessary, they are now charged to "eat of the produce of the land" (v. 11). They find that their Promised Land they've been seeking is not a place of rest and relaxation. It is a land of infinite possibility, and it is now our responsibility to "farm" it through our creative choices.
The chapter concludes with a powerful spiritual moment for Joshua, who is now the leader of the Hebrew people. In one of my favorite lines in all the Bible, he is told to "Put off your shoes from your feet; for the place where you stand is holy." Why is the land holy? It is the presence and spiritual awareness of Joshua himself that sanctifies any and every place where he stands. It's so for us as well. Once we become conscious of our true identity as spiritual beings, everything in our lives, every choice we make, becomes an opportunity to create a part of the kingdom. We certainly won't get it right all the time; we still have lessons to learn. But our wilderness experience is over; we can now consciously create the life experience we choose.