Os rune

Os, as, ask, ast=Ase[i.e., one of the Aesir], mouth, arising, ash, ashes.

A fourth still I know, when someone throws
my arms and legs into fetters:
as soon as I sing it, I can go forth,
from my feet fall the fetters
the hasp falls from my hands.

The mouth, the power of speach! Spiritual power working through speech[power of suggestion] bursts physical fetters and gives freedom, it itself conquers all conquerors, who only gain advantages through physical force, and it destroys all tyranny. Therefore: "Your spiritual force makes you free!"