An inspirational quote by St. Francis of Assisi is "Start by doing what is necessary; then do what is possible; and suddenly you are doing the impossible." Another inspiring quote from Helen Keller is "Keep your face to the sunshine and you cannot see a shadow."
Inspirational quotes typically contain a great deal of wisdom in a few short phrases. They are easy to remember and repeat to others. Quotes that allow the listener to imagine himself overcoming adversity are inspirational. So are quotes that help the listener find the positive aspects of a negative situation. Religious figures and successful people are frequent sources of inspirational quotes.
Quotes do not have to be serious to provide inspiration. Humor can be uplifting and impart wisdom as well. A Zig Ziglar quote that demonstrates this is "People often say that motivation does not last. Well, neither does bathing. That’s why we recommend it daily."
Many inspirational quotes are available at the Brainy Quote website. Its collection includes both religious and secular sources. A user can browse through quotes or search for quotes by a specific person. Brainy Quote includes basic information about each source of quotes, such as why the person is well known and when he lived. Forbes has an article on its website as well that lists 100 inspirational quotes from a wide variety of sources.