"We thought that, perhaps," said I, hesitating, "it is right to begin with the obligations of home, sir; and that, perhaps, while those are overlooked and neglected, no other duties can possibly be substituted for them."
Time is not an empirical concept. For neither co-existence nor succession would be perceived by us, if the representation of time did not exist as a foundation a priori.
Demonstration is also something necessary, because a demonstration cannot go otherwise than it does, ... And the cause of this lies with the primary premises/principles.
Some of the craftiest scoundrels that ever walked this earth . . . will gravely jot down in diaries the events of every day, and keep a regular debtor and creditor account with heaven, which shall always show a floating balance in their own favour.
Upon the solution of this problem, or upon sufficient proof of the impossibility of synthetical knowledge a priori, depends the existence or downfall of metaphysics.
It is clear, then, that wisdom is knowledge having to do with certain principles and causes. But now, since it is this knowledge that we are seeking, we must consider the following point: of what kind of principles and of what kind of causes is wisdom the knowledge?