How God Speaks To Men.

By Prophecy.

Acts 3:21 

Whom the heaven must receive until the times of restitution of all things, which God hath spoken by the mouth of all his holy prophets since the world began.

2 Peter 1:21 

For the prophecy came not in old time by the will of man: but holy men of God spoke as they were moved by the Holy Ghost.

Acts 11:27-28

27 And in these days came prophets from Jerusalem unto Antioch.

28 And there stood up one of them named Agabus, and signified by the Spirit that there should be great dearth throughout all the world: which came to pass in the days of Claudius Caesar.

Acts 21:10 

And as we tarried there many days, there came down from Judaea a certain prophet, named Agabus.

Hebrews 1:1

 God, who at sundry times and in divers manners spoke in time past unto the fathers by the prophets,

Still small voice.

1 Kings 19:12 

And after the earthquake a fire; but the LORD was not in the fire: and after the fire a still small voice.