It is idle to dispute with old men. Their opinions, like their cranial sutures, are ossified.
Santiago Ramon y CajalIntellectual beauty is sufficient unto itself, and only for it rather than for the future good of humanity does the scholar condemn himself to arduous and painful labors.
Santiago Ramon y CajalNothing inspires more reverence and awe in me than an old man who knows how to change his mind.
Santiago Ramon y Cajal