From these indubitable basic beliefs, Descartes then attempts to derive further knowledge. The "cogito" in particular is self-verifying, indubitable, immune to the strongest doubt. Science, then, could not find a secure foundation of indubitable truth. Hugh Brogan says that it was Ransome's ""first indubitable literary success. Maistre sees this as a law of human history as indubitable as it is mysterious. Venture capital refers to capital investment; equity and debt ;both of which carry indubitable risk.