He wrote to a friend: "You tell me that I shall astonish the world if I make out the demotic inscription on the Rosetta Stone. On the contrary, I think it astonishing that It should not have been made out already, and that I should find the task so difficult." In this excerpt, the author includes Thomas Young's words to show that Young

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as very little confidence in the ability of others. places a great deal of pressure on himself. feels that figuring out the inscription is useless. seeks public praise for his accomplishments.

In this excerpt, the author includes Thomas Young's words to show that Young  places a great deal of pressure on himself.

Explanation:

In the text above we can see that the possibility of deciphering the message of the rosette stone, the difficulty that this task has, the execution time and even the importance of this message, precede Young in a great way, much of this pressure is imposed by himself by account of the preciousness of the mission and his responsibility within that task.