The proverb "Haste makes waste" means that one may delay the time to complete one thing if he rushes to do it, because he may neglect something important in the process and has to do it again from the beginning. So one should do every step well.
Take remembering English words for example, every student wants to enlarge his vocabulary. But this aim cannot be achieved in one or two days. You should stick to remem bering some words a day and revise the words every few days. In this way you can keep the words in your mind firmly. There is mo shortcut. If you want to stuff all the words into your brain and mot to revise them, you will remember nothing. So don't be hasty. Haste makes waste.