Is this a real quote from Kant?
“Someone’s intelligence can be measured by the quantity of uncertainties that he can bear”
If so, what is the origin? In what context does he say it?
I don't know all of Kant's work but I know mainly his point was that using your reason is what gives you freedom, makes you human and is what gives hope to humanity. He never talks about knowledge, he talks about using your own intelligence. In other words, questioning things. He says weak people go for the easy answer, all made for them, all prepared. The hard thing to do is not be sure, is questioning and finding your own answers. Therefore, the more intelligent (and strong) you are, the more you're able to see things as uncertain and don't need the stable certitude of some pre-digested knowledge.
His text called What is enlightenment? is mostly what can be interpreted such as "Someone’s intelligence can be measured by the quantity of uncertainties that he can bear". But I have to say, even though its meaning made sens with my knowledge of Kant's theory, I never saw this quote within his work. I spent the afternoon trying to find it and, just like so many people, I can't. I really don't want to give up because it seems like something Kant would say, but so far, it only seem to be an interpretation of a part of his work.
Refer to Kant's What is Enlightenment? text.
To answer your question, I just happened to stumble upon an old book I had in my Library forever and it actually mentions this quote by Kant.
However my personal interpretation of this quote might be slightly different. I am all for about Kant's work encouraging its reader to use his/her logic and reason at life's given challenges facts and questions, but to me this particular quote [“Someone’s intelligence can be measured by the quantity of uncertainties that he can bear”] means that in life we will face uncertainties and there will be No time in our lives that we will be sure about everything. At some point during adulthood the uncertainties will continue to pile up and only a few stuff will remain certain (at least in our minds). To put it in other words I think this quote is building on Heraclitus "Everything flows" (Τα πάντα ρει)quote and it states that intelligent people can bear moving forward even when a lot of situations in their lives look like they could work... or not! In one word Uncertainty.
So the more of these situations a person can bear the more intelligence he is...? I would really like your input on this!