Successful people always focus on their goals and talk about mission and vision as they have no time to waste and talk behind back of others and they don't have time to pull others down.
Likely failures mostly make excuses, blame others and talk about others fault that they can hide their own faults. Mostly they are cheap and can't accept others success and think like a fool and react like a fool.
Recently I have seen some failure who were jealous with some other success and interfere on a life of a potential successful person, at the end they fail and the potential successful person simply ignore them and proceeding his own business.
People who have believe in their own guts is mostly successful. Because they don't waste time pulling others down and that make them more personate and active.
Talk behind back is a bad habit and people who does this actually don't respect themselves and they are actually impersonate type. If you can smell this kind of people around you better you keep a long distance with them.
Actually I feel pity on those who tries to go ahead or up by pulling others down because at the end of the day the person who wishes bad for others remain alone.
So better we do not join them and stay focused on our aim. Only our goals should be our concentration let people talk behind, laugh and demotivate you just need to ignore them all and go ahead, if you stop then it will be the win of your enemy so don't stop.
One day you'll realise that you saved your time by not focusing to your enemies and achieve you aim successfully. We should understand our priorities and the value of time in our life.