"I learned by close study that it made no difference what fair promises a political party, out of power might make to the people in order to secure their confidence, when once securely established in control of the affairs of society that they were after all but human with all the human attributes of the politician. Among these are: First, to remain in power at all hazards; if not individually, then those holding essentially the same views as the administration must be kept in control. Second, in order to keep in power, it is necessary to build up a powerful machine; one strong enough to crush all opposition and silence all vigorous murmurs of discontent, or the party machine might be smashed and the party thereby lose control. When I came to realize the faults, failings, shortcomings, aspirations and ambitions of fallible man, I concluded that it would not be the safest nor best policy for society, as a whole, to entrust the management of all its affairs, with all their manifold deviations and ramifications in the hands of finite man, to be managed by the party which happened to come into power, and therefore was the majority party, nor did it ten, nor does it now make one particle of difference to me what a party, out of power may promise; it does not tend to allay my fears of a party, when entrenched and securely seated in power might do to crush opposition, and silence the voice of the minority, and thus retard the onward step of progress."
January 1, 1970
https://en.wikiquote.org/wiki/Political_parties