No one needs negativity in his or her life. No one needs someone who constantly undercuts and opposes his or her attempt at success. No one needs a jealous person throwing obstacles of hindrance before them on the road to accomplishment. People who do these things should be first on the list of disassociation, regardless of who they are, even mother, father, friend or foe.
When the gift of motivation and courage entraps a person so they believe they can achieve whatever they want, there is always someone around to dampen the mood. If the achiever is weak, they will be thwarted in their efforts and will never know what they could have achieved. Then they will themselves, become an obstacle to someone else because they now feel nothing is achievable.
The first sign of recognizing a person who would rather you fail is to take a mental note of their first reaction to a great and achievable idea. If they suggest something otherwise on how they would do it or have any other opposing reaction, jealousy has reared its head. If they begin a story of someone they know who have tried the idea and failed, again, jealousy.
The opposite is also true. If there is a situation requiring a moral and or positive solution and they offer one of the opposite, they do not have your best interest at heart. For instance, a son calls his father for some marriage advice. He wondered what he should do after a major setback happened to his family. The son felt powerless because he was unemployed and could not do anything to provide for his family.
The father suggested the son take time off to rebuild, in other words, leave his family until he got himself together. Now if the son had no ability to reason for himself or had no sense of right and wrong, this advice could have torn up a perfectly good family. However, it was obvious to the son now how he and his siblings became so dysfunctional seeing the father had done the same to his own family.
With advice like that, who needs a father? If a father could pass that kind of advice to his son, imagine what lurks in the hearts of people who do not share the same bloodline. Friends, coworkers, and family are people we must deal with everyday, but we do not have to take their advice, suggestions, and certainly not their negative views about and on life.
If there is something you know you can achieve, no matter how far-fetched the idea may seem to someone else, if you believe it, you can achieve it. Quickly disassociate yourself from people who would rather see you fail and remain with them, and then surround yourself with people of equal and greater vision. Great people did not achieve what they did by associating with pessimistic people; they achieved what they did by surrounding themselves with achievers.
Source
http://afromerica.com/knowledge/psychology/networks/negative.php
I agree with the 'excuse vs motivation' belief, tho.