Anyone who cannot cope with mathematics is not fully human. At best he is a tolerable subhuman who has learned to wear shoes, bathe, and not make messes in the house.

The line is a deliberately abrasive piece of Heinlein-esque provocation: it equates mathematical competence with full participation in human rationality and self-governance. Read less literally, it argues that numeracy is not a narrow technical skill but a core literacy—necessary for clear thinking, judging evidence, and navigating a technologically mediated society. The insult (“tolerable subhuman”) functions rhetorically to shame complacency about innumeracy and to elevate STEM-style reasoning as a marker of maturity. At the same time, the quote’s contemptuous framing reveals an elitist strain: it reduces “being human” to one cognitive domain and ignores other forms of intelligence and cultural knowledge.