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The greatest killer of happiness is comparison. If you must compare， compare yourself to you yesterday
When you lend somthing pretend you are gifting. If it is returned， you'll be surprised and happy
If your opinions on one subject can be predicted from your opinions on another， you may be in the grip of an ideology. When you truly think for yourself your conclusions will not be predictable.
Don‘t purchase extra insurance if you are renting a car with a credit card.
If you loan someone $20 and you never see them again. That makes it worth $20.
Every breakthrough is at first laughable and ridiculous. In fact if it did not start out laughable and ridiculous， it is not a breakthrough.