Earlier quoted context omitted.
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And why would anyone do something good for someone else without an ulterior motive? Do you think people donate to charity because they are good or because they want to seem good? I met people IRL who acted "nice" except they were also aware they were being perceived as "nice" and explicitly called themselves "nice," wouldn't you agree this is hypocritical?
Moreover, if you are properly-aligned in life, whats good for others/the world is ALSO good for you. Even those who make genuine self-sacrifices would say so - at the very least, NOT having done it would be the real, unbearable, sacrifice.
I really hope you'll reflect deeply on this, and perhaps that it even haunts you - even if just out of pure self-centeredness, since the only people who you would ever have in your life with a mentality like this would necessarily be completely self-centered as well.