God has spoken; He is not silent. This is an axiomatic characteristic of God.
Therefore, if He has spoken; how has He done so?
Allow me to suggest at least six distinct ways in which God has spoken:
1. Through His Creation in Nature
"The heavens declare the glory of God, and the firmament shows his handiwork." Psalm 19:1
"The invisible things of him from the creation of the world are clearly seen." Romans 1:20
2. Through Special or Direct Revelation
God appeared to Moses in the form of a burning bush, telling him exactly what He wanted him to do. Exodus 3:2--4:17
3. In our Soul
"That which may be known of God is manifest in them." Romans 1:19
4. Through other of his followers – the Prophets
“After God spoke long ago in various portions and in various ways to our ancestors through the prophets.” Hebrews 1:1a
5. Through Jesus His Son
“…in these last days he (God) has spoken to us in a son, whom he appointed heir of all things, and through whom he created the world.” Hebrews 1:1b
6. Through His Word in Scripture
The Christian Bible assembles all the messages God wanted us to have for our admonition and edification. It is the only source of fully accurate knowledge about God.
“All Scripture is God-breathed and profitable for doctrine, for reproof, for correction, for instruction in righteousness, so that the man of God may be perfected, being fully furnished for every good work.” II Timothy 3:16-17
If God has spoken, we should indeed pay attention to what He has said; Are you listening?