If you want to dismiss a negative thought, the only way to do so is to think of something positive and constructive.
Emmet FoxStop thinking about your difficulties, whatever they are, and start thinking about God instead.
Emmet FoxA tragic mistake that is often made is to assume that the will of God is bound to be something very dull and uninviting, if not positively unpleasant. Consciously or not some persons look upon God as a hard taskmaster, or a severe parent. . . . The truth is that the will of God for us always means greater freedom, greater self-expression, newer and brighter experience, wider opportunity of service to others-life more abundant.
Emmet Fox