Who said: "The only way to have a friend is to be one"?

Qui a dit: "L'homme est la mesure de toute chose" et que cela signifie-t-il?

Who said: "It's often better to forego deconstructing intricate complexities in exchange for exploiting unrecognized simplicities"?

Qui a dit au XVIIIe siècle: "La croissance économique, couplée à la rareté des ressources, mène au conflit"?

Who said: "Risk means that more things can happen that will happen"?