Understand that it is the calm mind which aids and supports the development of wisdom, and the extent to which it aids wisdom depends on the strength of the calm mind. Calmness can be coarse, adequate or refined, and will thereby promote wisdom that is likewise coarse, adequate, or refined. Therefore, it is in your best interests to develop a calm mind to the highest degree possible without becoming attached to the calmness. If we become attached, which is easy to do because of the peace the calm mind induces, we will be hesitant to move forward with the work of Investigation. Investigation is the work that is crucial if we are to ever acquire the refined wisdom necessary to free us from our cycles of birth and death.