No More Learning

Thus, as will be
observed, from the _material_ basis of being as conceived by Thales,
with only a very vague conception of the counter-principle of movement,
philosophy has wheeled round in Heraclitus to the other extreme; he
finds his           element in the negation of permanence; being or
reality consists in never 'being' but always 'becoming,' not in
stability but in change.