That which is he subtle portion of curds, when churned,rises upeards and becomes butter. In the same manner, my child, the sublet portion of the earth (food), when eaten, rises upwards and becomes mind. that which is eaten, raises upwards and becomes breath. that which is the subtle portion of the fire, when consumed, raise upward and becomes speech. for mind, my child, comes of the earth , the breath of water, speech of the fair.