5 quotes
How many more years I shall be able to work on the problem I do not know; I hope, as long as I live. There can be no thought of finishing, for 'aiming at the stars' both literally and figuratively, is a problem to occupy generations, so that no matter how much progress one makes, there is always the thrill of just beginning.
It is difficult to say what is impossible, for the dream of yesterday is the hope of today and the reality of tomorrow.
The only barrier to human development is ignorance, and this is not insurmountable.
Every vision is a joke until the first man accomplishes it; once realized, it becomes commonplace.
It is not a simple matter to differentiate unsuccessful from successful experiments. . . .[Most] work that is finally successful is the result of a series of unsuccessful tests in which difficulties are gradually eliminated.
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