I thought it would be about teaching costing nothing to the educated or something along those lines, and trying to visualize how a rebuttal about the trade-off

I thought it would be about teaching costing nothing to the educated or something along those lines, and trying to visualize how a rebuttal about the trade-off in time spent could apply to the candle simile. Come to think of it I don't see how the positive people were similar to the candles — that simile is about making use of the positivity in your life, while the blog is about either the benefits of finding and reciprocating the positiveness in others (the candles don't choose to be lit in the first place) or reducing interaction with negative influences (the receiving candle can't choose to surround themselves with lit candles). I don't believe the simile really works with either, even though it's a nice image.