God’s word says it, believe it

God’s word says it, believe it, “When the even was come, they brought unto him many that were possessed with devils: and he cast out the spirits with his word, and healed all that were sick:  That it might be fulfilled which was spoken by Esaias the prophet, saying, Himself took our infirmities, and bare our sicknesses.”  Mathew 8:16-17 KJV

Notice it was Jesus word that cast out the spirits and healed all that were sick and it was to bring glory to the Father and bare witness to His greatness.  

“Verily, verily, I say unto you, He that believeth on me, the works that I do shall he do also; and greater works than these shall he do; because I go unto my Father.” John 14:12