I find that in order to persevere for a long time on something, I get very intense and obsessively focused on it. I find that if I am not very intense and obsessively focused on it, then I will not persevere. It's like I cannot modulate how I approach a major task.
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"You have a responsibility to consider all sides of a problem and a responsibility to make a judgment and a responsibility to care for all involved." --Ian Danskin