A power to dispose of estates for ever is manifestly absurd. The earth and the fulness of it belongs to every generation, and the preceding one can have no right to bind it up from posterity. Such extension of property is quite unnatural.
The mortal nature is seeking as far as is possible to be everlasting and immortal: and this is only to be attained by generation, because the new is always left in the place of the old.
A multitude of aspects of the natural world that were considered miraculous only a few generations ago are now thoroughly understood in terms of physics and chemistry.