| An ounce of discretion is worth a pound of wit | | It is better to be careful and discrete than to be clever. |
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| An ounce of prevention is better than a pound of cure | | It is even better to be cautious and prevent a misfortune or an accident from happening. |
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| Old habits die hard | | It is difficult to change a long-time habit |
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| Once bitten twice shy | | If a person has been tricked once he will more be careful and alert the next time. |
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| One good turn deserves another | | Always be ready to show kindness to people who have been kind to you |
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| One man's junk is another man's treasure | | People have different tastes, preferences, perceptions of the same thing |
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| One man's loss is another man's gain | | What is a disadvantage to one person can be an advantage to another |
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| One man's meat is another man's poison | | No two persons are alike - everyone has his own preferences, likes and dislikes. |
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| One man's terrorist is another man's freedom fighter | | There are always two sides to an argument and two perspectives to consider |
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| One swallow doesn't make a summer | | One success doesn't guarantee complete success |
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| Opportunity only knocks once | | Seize an opportunity when it occurs for it may never happen again. |
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| Opportunity seldom knocks twice | | You must be ready to grab an opportunity when it comes your way |
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| Out of sight, out of mind | | You will soon forget friends you do not meet or keep in contact with. |