On them depends …

Of course, there are original minds, people who do take their own line, who do not fall victim to the need to say, or do, what everyone else does. But they are few. Very few. On them depends the health, the vitality of all our institutions …

Doris Lessing, writer, 1919 – 2013
Group Minds
Prisons We Choose to Live Inside, Lecture IV
[Audio Recording: Doris Lessing – The 1985 CBC Massey Lectures]

Apology (Apologia Socratis), Plato

… if you kill me you will not easily find a successor to me, who, if I may use such a ludicrous figure of speech, am a sort of gadfly, given to the state by God; and the state is a great and noble steed who is tardy in his motions owing to his very size, and requires to be stirred into life. I am that gadfly which God has attached to the state, and all day long and in all places am always fastening upon you, arousing and persuading and reproaching you. You will not easily find another like me, and therefore I would advise you to spare me. I dare say that you may feel out of temper (like a person who is suddenly awakened from sleep), and you think that you might easily strike me dead as Anytus advises, and then you would sleep on for the remainder of your lives, unless God in his care of you sent you another gadfly. When I say that I am given to you by God, the proof of my mission is this:— if I had been like other men, I should not have neglected all my own concerns or patiently seen the neglect of them during all these years, and have been doing yours, coming to you individually like a father or elder brother, exhorting you to regard virtue; such conduct, I say, would be unlike human nature. If I had gained anything, or if my exhortations had been paid, there would have been some sense in doing so; but now, as you will perceive, not even the impudence of my accusers dares to say that I have ever exacted or sought pay of any one; of that they have no witness. And I have a sufficient witness to the truth of what I say – my poverty.

Plato. Apology, Part I