Amongst the famous original quotes is, “Opportunities are missed by most because they look like work” which was authored by Thomas Alva Edison. The quote is meant to encourage people to work hard and exploit all the opportunities that come their way since that’s where they have higher chances of succeeding.
Another popular and educative philosophical quote is “Worry does not empty tomorrow of its sorrow; it empties today of its strength.” This quote was originally authored by Corrie Boom and it advices people not to worry too much about what will happen tomorrow since it will make them unable to accomplish whatever they are doing today.
“Three can keep a secret if two of them are dead” is another famous quote which was originally authored by Benjamin Franklin. The quote emphasizes that if something is known by more than one person, then it is no more a secret since one of them will disclose it to others.
This might interesting for you: http://www.nps.gov/ever/parknews/quotes.htm