CLEOPATRA: If it be love indeed, tell me how much. ANTONY: There's beggary in the love that can be reckoned. CLEOPATRA: I'll set a bourne how far to be belov'd. ANTONY: Then must thou needs find out new heaven, new earth.
Hence the saying: If you know the enemy and you know yourself, your victory will not stand in doubt; if you now Heaven and you know Earth, you may make your victory complete.
The way of Heaven and Earth may be completely declared in one sentence: They are without any doubleness, and so they produce things in a manner that is unfathomable.