text: This philospher referred to the consistent conjunction of virtue and happiness using Cicero's term summum bonum, or highest good.
full_question: This philospher referred to the consistent conjunction of virtue and happiness using Cicero's term summum bonum, or highest good. Before G.E. Moore or Wittgenstein, he pointed out the leftness of a free-floating left hand to rebut "dogmatism" about absolute space, arguing instead that space and time are "forms of pure intuition" within the mind along with twelve (*) "categories of the understanding". In his attempt at a "Copernican revolution in metaphysics," this transcendental idealist argues that statements such as "7+5=12" can be deduced from simpler propositions without any empirical experience, showing that synthetic a priori truths are possible. FTP, name this Prussian Enlightenment-era philosopher who wrote Critique of Pure Reason. 
first_sentence: This philospher referred to the consistent conjunction of virtue and happiness using Cicero's term summum bonum, or highest good.
raw_answer: Immanuel Kant