So, the opening saying above is about a length of time in human movements of thinking, which has affect on the attitudes of the masses.
Humans do swing from far left to far right in thinking, attitudes and actions.
Example: After World War 2- after the bloodshed and desperateness demoralized in this human tragedy, the experience in the populace of the west, even all nations was to embrace humanity with Philia (brotherly) Love for
the purpose of bringing life to a higher, less desperate levels from the past.
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"Our appreciation for these Ancient Writings, The Bible, is Well placed". LM
Proverbs 4:25-27, 25 "Your eyes should look straight ahead, Yes, fix your gaze straight ahead of you. 26 Smooth out the course of your feet, And all your ways will be sure".
27 "Do not incline to the right or the left. Turn your feet away from what is bad" (far left-far right, extremes)