Men at forty Learn to close softly The doors to rooms they will not be Coming back to.

...but you have to know when you close those doors, you don't leave anything for the other person.

The doors of wisdom are never shut.

There are things known and things unknown and in between are the doors.

There are things known and there are things unknown, and in between are the doors of perception

There are things known and there are things unknown, and in between are the doors of perception.