A likely impossibility is always preferable to an unconvincing possibility.
The activity of happiness must occupy an entire lifetime; for one swallow does not a summer make.
... There must then be a principle of such a kind that its substance is activity.
If the hammer and the shuttle could move themselves, slavery would be unnecessary.
Emotions of any kind are produced by melody and rhythm; therefore by music a man becomes accustomed to feeling the right emotions; music has thus the power to form character, and the various kinds of music based on various modes may be distinguished by their effects on character.
To Thales the primary question was not what do we know, but how do we know it.