Knowledge expands the chest and widens it until it is wider than the world.

Ignorance engenders restriction, limitation, and confinement.

Thus the more a slave’s knowledge widens, the more his chest expands and widens. This is not the case with every type of knowledge rather it refers to the knowledge inherited from the Messenger, peace and blessings of Allah upon him. It is the only truly beneficial knowledge. Thus its people have the widest chests of all people, the widest hearts, the most excellent character, and the purest subsistence.

Ibn Qayyim, may Allah have mercy on him, Zad al-Ma’ad 2/23