Likutei Moharan, Part II 39:3/ליקוטי מוהר"ן·תנינא ל״ט:ג׳

13. [Regarding] that which our Sages, of blessed memory, taught: It would have been preferable for a person to have not been created than to have been created (Eruvin 13b) ; and also that which is written, “and better than both are those who have not yet come into being” (Ecclesiastes 4:3). The matter is perplexing, since, in that case, what is the reason he was created?

2Now, this was certainly said only from the standpoint of this world. Considering the adversities of this world and the afflictions which each and every person suffers here, it certainly would have been better to have not been created at all. But from the standpoint of the World to Come, it certainly is better to have been created, because specifically through this one attains the ultimate purpose, as mentioned above. And even in this world: Better one hour of repentance and good deeds in this world than the entire life of the World to Come (Avot 4:17).