“Now unto him that is able to do exceeding abundantly above all that we ask or think, according to the power that worketh in us.”
Ephesians 3:20 (KJV)
One of the things that strengthens our faith is our knowledge of Him and His ability. The only reason why a billionaire would promise you a hundred thousand dollars and you would believe it, rejoice and testify about it even though you are yet to receive it is because you have judged the person as able to give you that amount. You did not ask for his bank statement or a letter from his banker, confirming his ability to pay. No, you didn’t. Simply because of what you know of the man, you not only believed, you also testified.