I like this letter for its nod to bisexuality in character- both Jung's desire to make an impression and rouse others as well as Freud asking Jung to inseminate him, or have intellectual offspring with him.
It is immaterial whether or not one is understood by official representatives at the moment. Among the masses who anonymously hide behind them, there are enough people who want to understand and who, as I have often seen happen, will suddenly step forth. After all, one works primarily for the annals of history, and there your lecture in Amsterdam will stand out as a landmark. What you call the hysterical side of your character, the desire to create an impression and to influence people-the very qualities that make you a teacher and a pioneer-will come into its own, even if you haven't made any concessions to fashionable opinions. And if in addition you succeed to an even greater extent in imparting your personal leaven into the fermenting brew of my ideas, then there will no longer be any difference between your cause and mine.