Sometimes you have to make sure the person you love is good enough, and wont fail the test. Sometimes you have to hurt the person you love to see if they put up with your sh** and form an unhealthy relationship. This quote sucks and this philosophy is the reason a lot of people ruin good things. I like the rest though.
And if you ever in your life tried to use the stupid things, you know they're completely worthless. Thank god no one's ever used the nastygas, that would be a very thirsty couple of days.