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• Nature, time and patience are the three great physicians
• Necessity is the mother of invention.
• Necessity knows no law but to prevail
• Necessity makes even the timid bold
• Necessity never made a good bargain.
• Need teaches a plan.
• Never answer a letter when you are angry
• Never go to sleep with an argument unsettled
• Never hire anyone who will work for money alone!
• Never love with all your heart, it only ends in breaking.
• Never marry for money. You will borrow it cheaper.
• Never negotiate out of fear and never fear to negotiate
• Never put off till tomorrow what may be done today.
• Never think that you are not good enough yourself. 
• Never trouble trouble, till trouble troubles you
• Never trust a man who speaks well of everybody
• Never use reason against truth
• New are that you do not lose the substance by grasping at the shadow
• New opinion are always suspected, and usually opposed, without any other reason but because they are not common
• No body talks so constantly about god as those who insist that there is no god.
• No evil man is happy
• No good man ever became suddenly rich
• No great man ever complains of want of opportunity
• No job is finished till the proper work is done
• No machine can do the work of one extraordinary man
• No man can be a patriot on an empty stomach
• No man ever became wicked all at once
• No man is respected by others who is despised by his own relatives
• No man’s credit is as good as his money
• No one can go back and make a new beginning. But anyone can start from now and make a happy ending
• No one can make you feel interior without your consent, But you'd be a fool to withhold that from your superiors
• No one is rich enough to do without a neighbor.
• No one reaches a high position without daring
• No power is as potent as will power
• No questions is ever settled until it is settled right
• No rest for the wicked.
• No sensible man ever made an apology
• Noise proves nothing. Often a hen who has merely laid an egg cackles as if she had laid an asteroid
• Not to know certain things is a great part of wisdom
• Nothing dies faster than a new idea in a closed mind
• Nothing dries sooner than tears.
• Nothing is as burdensome as a secret.
• Nothing is impossible to a willing heart.
• Nothing is impossible to the man who doesn’t have to do it himself
• Nothing is more silly than silly laughter
• Nothing is so good as it seems before hand
• Nothing lasts for ever- not even your troubles
• Nothing that last too long is very agreeable, not even life
• Nothing venture, Nothing gained