The most essential factor is persistence - the determination never to allow your energy or enthusiasm to be dampened by the discouragement that must inevitably come.
James Whitcomb Riley
Rosa Parks' courage, determination, and tenacity continue to be an inspiration to all those committed to non-violent protest and change nearly half a century later.
Bob Filner
No problem is insurmountable. With a little courage, teamwork and determination a person can overcome anything.
B. Dodge