And habits are the very dickens[困难的] to change!Further, any change, even a change for the better, is always accompanied by drawbacks and discomforts. If you imagine that you will be able to devote seven hours and a half a week to serious, continuous effort, and still live your old life, you are mistaken. I repeat that some sacrifice, and an immense[过人的] deal of volition, will be necessary. And it is because I know the difficulty, it is because I know the almost disastrous[灾难性的] effect of failure in such an enterprise, that I earnestly advise a very humble beginning. You must safeguard your self-respect. Self-respect is at the root of all purposefulness.
有兴趣的童鞋们可以读一下第二句的“to devote seven hours and a half a week to serious effort” 这里的时间是怎么回事儿，呵呵