"In the past God spoke to our forefathers through the prophets at many times and in various ways, but in these last days he has spoken to us by his Son, whom he appointed heir of all things, and through whom he made the universe." Heb. 1:1-2, NIV
In the past God spoke - The book of Hebrews begins bluntly with God. There are no polite introductions, no prayers for the grace of God to be with the readers. It starts right with God. In that it reminds us of Genesis 1:1 - In the beginning God and John 1:1 - In the beginning was the Word. The author wants to get right to the "bottom line" as soon as possible. It all begins and ends with God.
In the past - the past is important. We need to know what God has done in the past because God does not change. What He has done in the past, He will do in the present and the future. We can study the great men and women of the Bible and Christian history. Through Jesus Christ they are our ancestors. What God did for them, He will do for us.
God spoke - The Bible takes for granted, and even emphasizes, that God communicates with His people. Our God is not stone, wood, an idea or an impersonal spirit. He is Real. He is Alive. And He communicates.
to our forefathers through the prophets - In the Old Testament era God could not express Himself as fully as was His heart's desire. Jesus had not yet died for sins. The relationship He could have was limited, but God spoke anyway. The heart of God is to be with His people. In the Old Testament selected men and women were prophets who heard from God and then communicated His will and desires to the people. And again, our spiritual genealogy goes straight through every man and woman of faith right back to the beginning of time.
at many times and in various ways - God does not limit Himself to one method. He is God and He will not be placed in a box by His creation. He seems to enjoy variety. And He speaks in many different ways. We have to keep an open mind. We tend to like formulas. It gives us a sense of control. If I do A and B, I will always get C. Sorry, God has unwavering principles, but a million different methods to accomplish His will. Actually, trying to use a formula to get God to do something is the same foundation on which witchcraft is based: attempting to use words and rites to manipulate the spiritual realm. The Word of God is our safeguard - we know God will never do anything in violation of His written Word. We must know the Word of God and be open to the method of God in each specific situation.
but in these last days he has spoken to us by his Son - The first thing to notice is the term "these last days." When are/were the last days? When He spoke to us by His Son, i.e. during the earthly ministry of Jesus. We can then ask, the last days of what? To which the simple answer is: during the last days of national Israel God spoke by His Son.
In the Old Testament God had to use prophets when He needed to communicate something. Now God has spoken through His Son. Jesus is the Word, the Final Word. No matter what false religions may say, no word from God will ever supersede the Word of God through Jesus Christ. Now, in the fullness of the New Testament age, God can speak to each believer; however, all revelation must be judged by the written Word of God. No revelation is of private interpretation.
whom he appointed heir of all things - Jesus is the heir of all things. Everything made belongs to Him. He is King of kings and Lord of lords. The entire universe and everyone in it is His property to do with as He pleases. As the absolute Heir, no one can accuse Him of being unfair or unjust. Our hearts should be forever grateful that He has chosen to include us in His family.
and through whom he made the universe - The entire Godhead was involved in the creation of the universe. Sometimes their roles seem to overlap or become confused, but this is because our human minds cannot understand the Trinity fully: Three yet One.