Anaximander of Miletus was the first philosopher who wrote his words. His most famous passage is, "The source of coming-to-be for existing things is that into which destruction, too, happens according to necessity; for they pay penalty and retribution to each other for their injustice according to the assessment of Time." This pessimistic expression presented existence as something that should not be. Any definite thing must pay for its individuality by, after a short time, passing back into its (apeiron) source. This source cannot also be definite. Therefore it is indefinite and does not pass away.
Anaximander was the first Greek to provide an ethical or moral interpretation of existence. For emerging from the primeval oneness, each definite individual thing must pay a price by returning. This meant that the individual, separate existence of each and every thing is unjust. It has no justification or value in itself.
His manner of living was in accordance with his thought. He dressed and spoke in a dignified, solemn manner. This unity of style was typical of the pre-Platonic philosophers.