I think that means that don't turn down a good opportunity that will help you in some way. You can't say''Oh thank you for that wonderful offer but i won't be needing it ."If you need a better job and a friend helps you get one you have to say thank you cause she did something that helped you in some way maybe tried so hard to get that interview she got fired for begging for that interview and you just turn it down and break her heart.