It means that we wish our own good. In the same way Christian Love (or Charity) for our neighbours is quite a different thing from liking or affection. We ‘like’ or are ‘fond of’ some people, and not of others. It is important to understand that this natural ‘liking’ is neither a sin nor a virtue, any more than your likes and dislikes in food are a sin or a virtue. It is just a fact.