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