"There is certainly no greater happiness than to be able to look back on a life usefully and virtuously employed, to trace our own progress in existence, by such tokens as excite neither shame nor sorrow."

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The best and safest way of philosophising seems to be, first to enquire diligently into the properties of things, and to establish those properties by experiences [experiments] and then to proceed slowly to hypotheses for the explanation of them. For hypotheses should be employed only in explaining the properties of things, but not assumed in determining them; unless so far as they may furnish experiments.

— Isaac Newton