Attempting a charitable (and somewhat objectivist) interpretation of this:
Other people are not entitled to your services, these can be given or withheld freely, and you do not need to feel shame for not sharing your abilities. In some situations not sharing or concealing your advantage over others may in fact be essential to your well-being or even survival.
And in some situations you may already be indoctrinated into beliefs about your own capabilities and society's expectations that you use them which may be detrimental to your well-being or survival. For example, I know people who say they believe they should always stand up for victims in violent situations. In practice, real people are smarter than this, and keep their eyes down and their mouths shut - but occasionally you get a fool who actually believes it, because nobody actually told him any better.
I've known exactly three people who were actually c...
P/S/A: There are single sentences which can create life-changing amounts of difference.