In response to the first question, knowledge brought many advantages to the Brahmin, such as increased social status and opportunities for wealth and power. Knowledge allowed the Brahmin to perform religious duties, such as reciting mantras, and to participate in philosophical discussions, giving him a sense of intellectual superiority over others. Additionally, the Brahmin could use his knowledge to teach others, gaining respect and admiration.
One advantage I would add is that knowledge allows us to make more informed decisions in our personal and professional lives. By having more knowledge, we can make better choices that lead to better outcomes.
Sometimes knowledge makes us unhappy because it can reveal unpleasant truths about the world and ourselves. For example, learning about climate change or social injustice can be distressing, and realizing our own shortcomings or mistakes can be uncomfortable.
Regarding the last question, I believe it is important to seek knowledge and strive for personal growth, even if it means facing difficult truths and uncomfortable emotions. Ignorance may bring temporary happiness, but it is not a sustainable or fulfilling way to live.