Many of the great mastermind thinkers throughout history have known that we become our thoughts. It is important that when a situation moves into your life, which may cause you to worry, that you choose to exercise the discipline to not engage in the very destructive meditations of worry. Excessive worrying is a sign of an undisciplined mind. It is a form of weakness, recklessness, and self-indulgence in negativity, and it is very dangerous. The human mind is the most powerful instrument on earth. The occupations of your mind should be your primary concern. There are better things your mind could be doing; much more constructive things that a powerful instrument of creation such as your mind could do with its time, rather than simply meditating on negativity.
— Bryant McGill
post "Weathering the dark clouds of worry and doubt"