Yama
On the first panel, a Triangle-person is walking up a mountain, sweating, leaning on a stick, and carrying a travel bundle. Subtitle: 山を歩めば - Walk the mountain
On the second panel, the scene is zoomed out far away, showing they are really climbing a gigantic Triangle-person. Subtitle: 山と成る - Become the mountain.
山を歩めば山と成る (Yama o ayumeba yama to naru) means: if you tread the mountain enough times, you become the mountain. Striving to achieve a goal eventually leads to not just achieving it, but to embodying its qualities.
I do hope I got my Japanese right, because I made the saying up!