Praise is the reflection of virtue.
...neither is it possible to discover the more remote and deeper parts of any science, if you stand but upon the level of the same science, and ascend not to a higher science.
Half of science is putting forth the right questions.
Always let losers have their words.
Fortune is like the market, where, many times, if you can stay a little, the price will fall.
Observation and experiment for gathering material, induction and deduction for elaborating it: these are are only good intellectual tools.