Old wineskins have lost their elasticity. They are no longer pliable and able to stretch and yield to pressure.
If we are not watchful, we can become so entrenched in what we already have learned or experienced that we become unable to move beyond our past.
We can take on a, “Don’t confuse me with the facts. My mind is already made up,” mentality. Be quick to listen and critically consider and be slow to form opinions and speak.
This applies to all areas of life but is most important to our well being as it concerns the things of God.
Keep learning, yielding, changing, and being transformed by the Word of God so he can fill you again and again with fresh revelation into the knowledge of Him.