'A thing must be understood as certain and true in order to be known without any doubt. But for this reason, that finite knowledge had faults and defects in thy design, therefore has thou been strangled in thine own doubts. Thou hast supposed that there is no need for closing with the true seal, and hast thought to be a seal thyself; but therein thou wast in error and art not what thou hast supposed thyself to be. This will give thee a miserable death. For thou hast lived on and on in doubt, and others with thee have built upon sand. They have wept, and thou shalt weep yet more.'