"The power of taming the great. Perseverance is advantageous. Not eating at home brings fortune. It is advantageous to cross the great waters."
The mighty Heaven is contained and guarded by the immovable Mountain. Unlike the "Power of Taming the Small," which employed micro-adjustments, here the energy retained is colossal. It is the moment to gather strength, to cultivate oneself through the study of the ancients, and to accumulate immense wisdom. Once this energy is stored, one must not remain idle at home ("not eating at home") but engage in very great public projects.
"Heaven within the mountain: the image of the power of taming the great. Thus the noble man familiarizes himself with a great number of words from antiquity and high deeds of the past, in order to fortify his character."
The mountain contains the treasures of the past. Study History, philosophy, science. Build an immense reservoir of knowledge before acting.