We have found a way of life that works.
We have 3300 years of testing under every possible social, economic, political and geographical condition to prove that.

Yes, you could do it yourself—test all the possible styles of life, make comparisons and come to your own conclusions.
But what a waste of precious time it will be, for yourself and for the world that could be benefiting from you. After all, how much life will you have left after reaching your conclusions?