The gate of the mind
שאו שערים ראשיכם והנשאו פתחי עולם ויבוא מלך הכבוד
Lift up your heads, O gates, the uplifted, O eternal portals, so that the King of glory may enter. (Tehillim 24:7)
Commenting on this verse, the Degel Machaneh Ephraim explained that the mind is the gate through which a person can enter to approach the King.
This gate is never locked yet we always seem to get side-tracked from ever setting foot on the other side of the threshold. Inside this gate we can approach the King and ask him the question we have always wanted answered. The fact that He may not answer us today should not discourage us. The gate is always open. Perhaps He may answer when we return tomorrow.