How did Jonas demonstrate wisdom in The Giver?

This is an interesting question because wisdom is trait
that we need to infer from what Jonas does and says rather than being a characteristic
that is directly applied to his person. To answer this question we need therefore to
analyse what he says, does and thinks, and find an incident where he demonstrates
wisdom. For me, I think we can find such an incident in Chapter Seventeen, when Jonas
tries to explain to Asher that the game they are playing actually came from wars that
were fought long ago through suffering. Although he tries initially to explain to Asher
what is bothering him, at the same time he shows wisdom is recognising that he is not
able to do so, even though this leaves him feeling intensely sad and
depressed:

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Jonas trudged to the bench beside the Storehouse
and sat down, overwhelmed by feelings of  loss. His childhood, his friendships, his
carefree sense of security--all of these things seemed to be slipping away. With his
new, heightened feelings, he was overwhelmed by sadness at the way the others had
laughed and shouted, playing at war. But he knew that they could not understand why,
without the memories.

Jonas
thus shows wisdom in identifying the changes that have happened to him and the very
person that he is now, and the way that this has created a division between him and his
friends, but also the way that he cannot attempt to try and mend this division. He
recognises the futility of trying to explain.