God has revealed Himself in His Word.
OMNISCIENCE OF GOD - "The secret things belong unto the Lord our God:" - God knows everything, and rightfully keeps some things to Himself. See Psalm 139.
OPENNESS OF GOD - "but those things which are revealed belong unto us and to our children for ever..." - God has given us His Word so we can understand all that we need to know. See Psalm 119:97-104, Romans 15:4, 2 Timothy 3:16-17
OBEDIENCE TO GOD - "that we may all the words of this law." We are expected to be obedient to the truth which God has revealed to us in His Word! 1 Samuel 15:22-23