Philosophy of science is philosophy enough.

Our statements about the external world face the tribunal of sense experience not individually but only as a corporate body.

To be is to be the value of a variable.

For Being is, and non-Being is not.

-- Parmenides

Philosophy is the knowledge of beings qua beings.

-- Farabi

For whom emptiness works, everything works. For whom emptiness does not work, nothing works.

-- Nagarjuna

All things flow.

-- Heraclitus

Being determines consciousness.

-- Karl Marx

I think, therefore I am.

-- René Descartes