I think I parsed that quote less along the lines of 'dude, you hardly know any math and so I won't love you' and more along the lines of 'dude, you seem to have the same taste for movies and music and we can have a conversation -- I love (hanging out with) you'.
The former has an objective measure and thus one can speak of definite growth while the latter is subjective.
That's not what I mean. Suppose you have various negative personality traits that are negatively influencing your life (e.g. perhaps you are selfish or short-tempered). If you don't carefully cull the people around you, you might start noticing that many people react negatively to you, and you might start wondering why. If you determine that the problem is with you and not them, that's an opportunity for growth. If you only surround yourself with people who are willing, for whatever reason, to ignore your negative personality traits, then you've lost an op...
Another monthly installment of the rationality quotes thread. The usual rules apply: