斉 unison

Let's call that weird bit below "sentence" a ladder - it kind of looks like a ladder. So. . .

If you SAY the same thing in unison with everyone else, you can move up the ladder of culture.

together, in unison ★☆☆☆☆
一 (one) + 斉 (unison) = 一斉 (together, in unison)