Great power; strong momentum, but don't overreach.
The image
Thunder over heaven: thunder in the sky. Great power; don't abuse it.
Judgment
大壯：利貞。
Great power: perseverance furthers. With strength comes the duty to stay upright.
Line texts
初九：壯于趾，征凶，有孚。 Power in the toes; going on brings misfortune. Don't push too early.
九二：貞吉。 Perseverance brings luck.
九三：小人用壯，君子用罔，貞厲，羝羊觸藩，羸其角。 The petty use power, the noble do not. Perseverance is dangerous. A goat butts against a hedge and gets its horns entangled. Force traps you.
九四：貞吉，悔亡，藩決不羸，壯于大輿之輹。 Perseverance brings luck; remorse disappears. The hedge opens, the horns are free. Power like the axle of a big cart. Obstacles fall away.
六五：喪羊于易，無悔。 Losing the goat with ease: no remorse. Let go of the urge to win.
上六：羝羊觸藩，不能退，不能遂，無攸利，艱則吉。 A goat butts against a hedge; it cannot go back or forward. Nothing furthers. If one notes the difficulty, good fortune. In a deadlock, endure.