God has spoken in the past through the prophets and by His son: claims from the Old Testament written in the book of Hebrews in the New Testament. If God speaks, and we listen, what are we to do with what we hear?
(Hebrews 1:1 KJV) God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets, (Hebrews 1:2 KJV) Hath in these last days spoken unto us by his Son, whom he hath appointed heir of all things, by whom also he made the worlds;