A former Olympic athlete had this to say; We were not chosen to represent the US because we were the fastest or the strongest, but we were chosen because we possessed stamina. They could train us to be faster and stronger but they first needed participants who could endure rigorous training and conditioning.
The same applies to you. The Lord did not choose you because you were strong, swift, eloquent, attractive and witty but because He knew you had stamina. He knew that you were able to endure the storms of life and endure hardness as a good soldier. And every time you go through your tests and emerge another man, you prove to the enemy that the Lord was absolutely right.