There is no greater impediment to progress in the sciences than the desire to see it take place too quickly.

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• Georg C. Lichtenberg:

  Doubt must be no more than vigilance, otherwise it can become dangerous.

• Georg C. Lichtenberg:

  To do the opposite of something is also a form of imitation, namely an imitation of its opposite.

• Georg C. Lichtenberg:

  Nothing can contribute more to peace of soul than the lack of any opinion whatever.

• Gottfried Leibniz:

  But in simple substances the influence of one monad over another is ideal only.

• Gottfried Leibniz:

  Finally there are simple ideas of which no definition can be given; there are also axioms or postul

• Gottfried Leibniz:

  For since it is impossible for a created monad to have a physical influence on the inner nature of

• Gottfried Leibniz:

  I also take it as granted that every created thing, and consequently the created monad also, is sub

• Gottfried Leibniz:

  I hold that the mark of a genuine idea is that its possibility can be proved, either a priori by co

• Gottfried Leibniz:

  I maintain also that substances, whether material or immaterial, cannot be conceived in their bare

• Gottfried Leibniz:

  Indeed every monad must be different from every other. For there are never in nature two beings, wh