A short time before the deathof Amaranta she suddenly stumbled into an open space of lucidity within the madness and she trembled before the uncertainty of the future.
His interminable conferences resulted in nothing, and as the benefit of the long rest made itself felt, it produced an increased mental lucidity which rendered inaction more and more unbearable.
The German scientist Hermann von Helmholtz, no intellectual slouch himself, wrote that Kelvin had by far the greatest intelligence and lucidity, and mobility of thought of any man he had ever met.