We are only that amphibious piece between a corporal and spiritual essence, that middle form that links those two together and makes good the method of God and nature, that jumps not from extremes but unites the incompatible distances by some middle and participating natures. . . . Thus is man that great and true amphibium whose nature is disposed to live not only like other creatures in diverse elements but in divided and distinguished worlds. For though there be but one to sense, there are two to reason: the one visible, the other invisible. . . .
--Sir Thomas Browne, Religio Medici