The violinist must possess the poet's gift of piercing the protective hide which grows on propagandists, stockbrokers and slave traders, to penetrate the deeper truth which lies within. Yehudi Menuhin
Some impose upon the world that they believe that which they do not; others, more in number, make themselves believe that they believe, not being able to penetrate into what it is to believe. Michel de Montaigne
There is no way to penetrate the surface of life but by attacking it earnestly at a particular point. Charles Cooley
Although to penetrate into the intimate mysteries of nature and thence to learn the true causes of phenomena is not allowed to us, nevertheless it can happen that a certain fictive hypothesis may suffice for explaining many phenomena. Leonhard Euler
It is a thorny undertaking, and more so than it seems, to follow a movement so wandering as that of our mind, to penetrate the opaque depths of its innermost folds, to pick out and immobilize the innumerable flutterings that agitate it. Michel de Montaigne
Man will not always stay on earth; the pursuit of light and space will lead him to penetrate the bounds of the atmosphere, timidly at first, but in the end to conquer the whole of solar space. Konstantin Tsiolkovsky