Mark Twain is one of the most quoted authors ever. There are hundreds of his quotations（语录） on posters and websites. Here is an example：
"If you tell the truth, you don't have to remember anything. "—Mark Twain.
Quotations like this one give us guidance. It reminds us that telling a lie is much more difficult than telling the truth. Telling a lie means you have to remember what you said each time you tell the lie. If you tell the truth, there is nothing to remember. He suggests that you shouldn't lie not because it is wrong, but because it is hard work. Here is another example.
"Always obey your parents when they are present. " —Mark Twain
Again, the quotation give good advice﹣to always obey your parents, but the humorous part is when they are present. The quotation tells you to obey your parents when they are there with you — because they can see what you are doing.
Albert Einstein's quotations are also popular. Many of his quotations are inspirational（鼓舞人心的）. This means that they help us to do our best and be the best person we can be. Here is an example：
"Learn from yesterday, live for today, hope for tomorrow, The important thing is not to stop questioning. "—Albert Einstein
This is a much more serious quotation than the two Mark Twain ones. It gives us a lot to think about. Also, because this was said by Albert Einstein, it makes us want to take the quotation serious. This quotation give us hope that that we can learn from any mistake we made yesterday. It reminds us to always look closely at everything we do and ask the right questions to help us achieve our best.
