“The secret things belong unto the LORD our God: but those things which are revealed belong unto us and to our children forever, that we may do all the words of this law.” Deut. 29:29
“It is the glory of God to conceal a thing: but the honor of kings is to search out a matter.” Prov. 25:2
Out of strange perplexities and trials, the God whose glory was that He had concealed things and yet had Himself been the All-Wise, had led them into better ways of life. Yet had not all this resulted from the fact that they had been under the rule of a king whose highest glory had been that of searching out the secrets of wisdom, in the fear of Jehovah! The words, however, have the widest application. They cover all life. When Solomon wrote this Proverb, it is possible that he was remembering a great word of Moses (Deut. 29:29). The philosophy is the same. The idea here is not that God maintains His glory by hiding things from man. It is rather that all the things so hidden the things concealed, the secret things are known to Him. He is the Ultimate in wisdom. That is His glory. That being so, man's true kingliness consists in his ability to search out these hidden things. That is the principle of all the triumphs of scientific investigations and it is the deepest secret of all advances in spiritual strength. If a man would reign in life, he must begin with the fear of Jehovah which recognizes the glory of His knowledge of hidden things; and he must continue in that fear which maintains the attitude of such right relationship with God as will make it possible for Him to reveal to him His secrets. "The friendship of Jehovah is with them that fear Him." (Psa. 25:14). See Matt. 10:27. Friends of God have truth shared while servants blindly follow direction. (John 15:15).
Not so with the unbelieving. The unsaved are Blind-Deaf-Dumb.
“That seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.” Mark 4:12
State of the people who need to hear the gospel. State of the Jews that rejected Christ while on earth, foreseen by Isaiah. Even though they hear the truth it is not understood.