Be like water making its way through cracks. Do not be assertive, but adjust to the object, and you shall find a way round or through it. If nothing within you stays rigid, outward things will disclose themselves.Shihan Jerome recommended a book to me that takes it's title from that quote, Be Like Water: Practical Wisdom from the Martial Arts. Written by Joseph Cardillo, a student of Kempo, it has applications both in the study of martial arts and in daily life. It is a reflection on focusing on core principles that Aikidoka will recognize.
Empty your mind, be formless. Shapeless, like water. If you put water into a cup, it becomes the cup. You put water into a bottle and it becomes the bottle. You put it in a teapot it becomes the teapot. Now, water can flow or it can crash. Be water my friend.
Be Like Water
There is a well known quote from Bruce Lee about fluidity in thought and action.