A) Feeling Down. The extent of negative feelings can go from Anger, Frustration, Irritability, to even Anxiety and Depression, passing through many other feelings, none of them pleasant.

B) Physical effect. The body lowers its defences, as negativity subtracts from our energy.

C) Closing oneself down to possibilities and the flow of abundance. When we are in a negative state, we do not attract those elements that would make our lives advacne; rather we attracts the circumstances that support us in thinking something wrong and we get stuck. Infact love to get in stuck

D) It's a waste of time. Look at all effect of negative thinking explained above; can you tell me one single benefits of thinking negatively and being in a negative mood?

    Any other than the realisation that it's much better to think positively, negative thinking  doesn't contribute to our life; rather it detracts.