Albert Schweitzer? Jim Valvano? Erica Anderson? C. T. Campion? Apocryphal?

Question for Quote Investigator: Maintaining a high level of enthusiasm and motivation is difficult. Sometimes our inner fire starts to sputter. Happily, this fire can be reignited by an experience with another person. We owe that person our deep thanks.
Apparently, Alsatian physician and humanitarian Albert Schweitzer said something like this, but I have been unable to find a citation. Would you please help?
Reply from Quote Investigator: In 1924 Albert Schweitzer published “Aus meiner Kindheit und Jugendzeit” (“Memoirs of Childhood and Youth”). The following passage translated by C. T. Campion from German to English discussed igniting and reigniting an inner fire. Boldface added to excerpts by QI:1
As a rule there are in everyone all sorts of good ideas, ready like tinder. But much of this tinder catches fire, or catches it successfully, only when it meets some flame or spark from outside, i.e. from some other person. Often, too, our own light goes out, and is rekindled by some experience we go through with a fellow-man. Thus we have each of us cause to think with deep gratitude of those who have lighted the flames within us.
Below are additional selected citations in chronological order.
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