What does Su Shi think is the cause of Jia Yi's tragedy in On Jia Yi?

On Jia Yi is a character commentary written by Su Shi, a writer in the Northern Song Dynasty. The object of the commentary is Jia Yi, a politician in the Wendi period in the early Western Han Dynasty. The full text is based on Jia Yi's frustration, deeply analyzing Jia Yi's personality traits, and at the same time analyzing the historical background at that time, combining reality with reality, contrasting positive and negative, highlighting Jia Yi's personality with a step-by-step approach and firm tone, holding that the reason for Jia Yi's tragedy is that he can't "use his talents for his own use", "be bad at being poor", "be ambitious but small in quantity", and emphasizing his life of "waiting for something" and "forbearing" The last paragraph summarizes the purpose of the article: to persuade Renjun to meet such talents as Jia Yi, to use them boldly and not to miss the opportunity; Persuade Jia Sheng-style people to love themselves and be good at using their talents for their own use. The argument is well-founded and well-organized.