Quantitative work shows clearly that natural selection is a reality, and that, among other things, it selects Mendelian genes, which are known to be distributed at random through wild populations, and to follow the laws of chance in their distribution to offspring. In other words, they are an agency producing variation of the kind which Darwin postulated as the raw material on which selection acts.
John B. S. HaldaneTeleology is like a mistress to a biologist: he cannot live without her but he's unwilling to be seen with her in public.
John B. S. HaldaneThe advance of scientific knowledge does not seem to make either our universe or our inner life in it any less mysterious.
John B. S. Haldane