The Divine One spoke through the Holy Spirit. So the highest form of speech from God to the more spiritually advanced of the human race is the Light and Sound. In fact, everyone who has made a contribution to the human race has heard or seen the True Voice. The ways of God are many. God often speaks in a less direct manner to dreamers, poets, visionaries, and prophets.
History tells of many such people.
A list of famous people who have been a mouthpiece for the Voice of God includes the likes of Socrates, Plato, Elijah, King David, Mozart, Beethoven, Jung, Einstein, Shelley, Edison, Michelangelo, and thousands more. Each does his best to render the Divine Will into human terms, using a natural genius as the tool of communication. The Sound and Light carry out God's scheme of creation. So the highest anyone can aspire to is a life of high creativity, but always guided by the force of divine love. That is how to be most like God.