Uoıʇdǝɔɹǝd uo ʎlǝlos pǝsɐq sı ǝnɹʇ sı ʞuıɥʇ ǝʍ ʇɐɥʍ ɟo ɥɔnɯ ʍoɥ?

Well, some perception is required for reasoning to have a basis in reality, but in time our thinking is more and more based on reasoning.