An open mind is a treasure. All too often we go about our day judging others, sticking to our own beliefs of what is valid, and not willing to see the views of others. Of course we have to discern what is right from wrong, good from evil, but we can learn from others as much as we can from teachers or ourselves.
Here is an excerpt from the Tao Te Ching Chapter 11:
If you mould a cup you have to make it hollow;
It is the emptiness within that makes it useful.
In a house or room, it is the empty spaces-
Doors, windows, rooms- that make it usable.
They all use what they are made of to do what they do,
But without their nothingness they would be nothing.
Now, it's not talking about being empty in the sense of "personality," but rather your mind. A more modern quote, from Bruce Lee, is as follows:
Empty your cup so that it may be filled; become devoid to gain totality.
Let's all try not to let our personal beliefs restrict us of learning new things, showing us new ideas, or even ways to improve our lives.