Your own resolution to succeed is more important than any other one thing. (Abraham Lincoln, 16th president of the United States)
When you think of all the failures Lincoln experienced, you marvel at his persistence in keeping at it. He lost numerous elections, was considered an inadequate administrator and a second-rate orator. Yet, his achievements in becoming and serving as the U.S. president during the Civil War are a testimony to his perseverance and doggedness.
Let perseverance finish its work so that you may be mature and complete, not lacking anything (James 1:4).