Psalm 18:32 (King James Version)
32It is God that girdeth me with strength, and maketh my way perfect.
It is God who gives us strength to go forward. The definition of the word persevere is to persist in anything undertaken; maintain a purpose in spite of difficulty, obstacles, or discouragement; continue steadfastly.
Some years ago I was hurting really bad. I felt like I was not accomplishing anything in my life.