The game played by idealism has been turned against itself. Inner experience is itself possible only mediately, and only through outer experience. The representation 'I' is not an intuition , it is an intellectual representation of the spontaneity of the thinking person. The necessity of existence can never be known from concepts, but always only from connection with that which is perceived. It is not the existence of substances that we can know necessarily, only the existence of their state in accordance with the law of causality.
Nothing happens through blind chance.
No necessity in nature is blind, but always conditioned and therefore intelligible necessity. Principle of Continuity forbids any leap in the series of appearances. Principle of Continuity forbids any gap in the series of appearances. There is not more that is possible than is actual. The Principles of Modality are not objectively synthetic.