AMEN!
The certainty with which Paul spoke those words should give us all great strength and comfort. Likewise the words of John and Jesus.
The Father loveth the Son, and hath given all things into his hand. He that believeth on the Son hath everlasting life: and he that believeth not the Son shall not see life; but the wrath of God abideth on him." -- John 3:34-36"For he whom God hath sent speaketh the words of God: for God giveth not the spirit by measure unto him.
But the hour cometh, and now is, when the true worshippers shall worship the Father in spirit and in truth: for the Father seeketh such to worship him. God is a spirit: and they that worship him must worship him in spirit and in truth." -- John 4:22-24"Ye worship ye know not what: we know what we worship: for salvation is of the Jews.