Locke's thoughts about Causality and Active Power are especially noteworthy, for he rests our knowledge of God and of the external universe on those ultimate ideas.
But this is by no means the whole or even the principal part of Berkeley's philosophy; it is essentially a theory of causality, and this is brought out gradually under the pressure of difficulties in the first solution of the early problem.
He facilitated this awkward transition by adding to Kant's a priori forms of space and time an " a priori form of alternative causality," or, as he also called it, " an intuition of causality involved in the elementary exercise of perception," which is the key to his whole philosophy.
In the first place, the intuition of causality does not require will at all, because we often perceive one bodily member pressing another involuntarily; a man suffering from lockjaw neither wills nor can avoid feeling the pressure of his upper and lower jaws against one another.
Nevertheless he gives absolutely no proof of the assumption that there is no sense of causality.
