I enjoy witty and insightful quotations. Here are a few without any attempt to put them in some logical order but simply represent quotations I liked.

• 20 years from now you will be more disappointed by the things you didn't do than by the ones you did do. So throw off the  bow lines. Sail away from the safe harbor. Catch the trade winds in your sail. Explore. Dream. Discover. (Mark Twain)
• your attitude is like a box of crayons that color your world. Constantly color your picture gray, and your picture will always be bleak. Try adding some bright colors to the picture by including humor, and your picture begins to lighten up. (Alan Klein)
• In the book, the life of Saul Bellow, it reports that Bellow taught his son to point first to his ass, then to his elbow, and declared him "smarter than most Harvard graduates."
• life is 10% what happens to you and 90% how you react to it (Charles Swindoll)
• the secret of getting ahead is getting started (Mark Twain)
• your talent is God's gift to you. What you do with that is your gift back to God. (Leo Buscaglia)
• change your thoughts and you change your world. (Norman Vincent Peale)
• if you do what you always did, you will get what you always got. (Anonymous)
• just when the caterpillar thought the world was ending, it turned into a butterfly. (Proverb)
• no one can make you feel inferior without your consent (Eleanor Roosevelt)
• if you're going through hell, keep going (Winston Churchill)
• if you can't explain it simply, you don't understand it well enough (Albert Einstein)
• do one thing every day that scares you (anonymous)
• there are two types of people who will tell you that you cannot make a difference in this world: those who are afraid to try and those who are afraid you will succeed (Ray Goforth)
• I find that the harder I work, the more luck I seem to have (Thomas Jefferson)
• all progress takes place outside the comfort zone (Michael John)
• the successful warrior is the average man, with a laser like focus (Bruce Lee)
• you measure the size of the accomplishment by the obstacles you had to overcome to reach it (Brooker T Washington)
• what would you do if you weren't afraid to try it (Spencer Johnson)

Perhaps something  here will motivate you. I believe in having affirmations like this where you can read them often. It is inspiring for me.