The circumstance should have been encouraging. But somehow it was not. What was possible to Thorndyke was, theoretically, possible to me⁠—or to anyone else. But the possibility did not realize itself in practice. There was the personal equation. Thorndyke’s brain was not an ordinary brain. Facts of which his mind instantly perceived the relation remained to other people unconnected and without meaning. His powers of observation and rapid inference were almost incredible, as I had noticed again and again, and always with undiminished wonder. He seemed to take in everything at a single glance and in an instant to appreciate the meaning of everything that he had seen.