David heard from God

An example of God speaking to a man directly without doing it through His word, servants or dreams is written in 1 Chronicles 28:11-12. “Then David gave his son Solomon the plans for the portico of the temple, it's buildings, it's storerooms, it's upper parts, it's inner rooms and the place of atonement. He gave him the plans of all that the Spirit (of God) had put in his mind for the courts of the Lord.”

King David obeyed all the instructions he received from God concerning the building of the temple of God, as he waited and focused on the Lord. It was so vivid and a clear description from God so much that David said this in verse 19 of same chapter, “All this is contained in the plan written   according to the instructions which the Lord Himself gave me to carry out.”

As complex as the instructions were, he painstakingly catalogued every thing the Lord spoke to him through his spirit man. He did not choose what to obey because, he knew the temple was for the Lord and so it had to be built according to the architectural design of the Spirit of the Lord.

Understanding God after you have known Him ultimately depends on complete sacrifice of obedience; that is listening and obeying God without which the relationship or walk cannot flourish.

To obey, you need to do what Samuel did in 1 Samuel:3, it takes focus, waiting and listening to the Lord, for God definitely has a lot to say to whoever continues to know Him.

When God began to talk with us, we wrote a lot down so much that we thought after a while, the Spirit of God would not have much to say to us again. However, we found out the Lord had much more to say to us, but the catch there was we had to obey what we received initially before more is given to us.