James 1:3-4

Be assured that the testing of your faith (through experience) produces endurance (leading to spiritual maturity, and inner peace). And let endurance have its perfect result and do a thorough work, so that you may be perfect and completely developed (in your faith), lacking in nothing.

Jesus overcame the world when He died on the cross and transferred the ability of faith to those who believe in Him. That knowledge of the transfer should increase our belief in the Word and our abilities with the Word to overcome the circumstances. Our faith must be practiced for us to succeed, and we must endure to grow and learn how to use the tools Jesus gave us to succeed.