大志を抱 is a single Japanese word that kind of reads like a short proverb.

It suggests that you should have “high aims,” “ambitions,” or “aspirations” in your life.

少年よ大志を抱け was a sort of motto or proverb invoked by William Clark after being hired by the Emperor of Japan in 1876 to establish a university in Hokkaido, Japan.

This phrase has been famous across all generations of Japan since that time.

More about William S. Clark's adventures in Japan.

Note: Because this selection contains some special Japanese Hiragana characters, it should be written by a Japanese calligrapher.

大志を抱く is a Japanese proverb that suggests you should embrace, pursue, and realize your ambitions.

The first part means ambitions or aspirations.

The last part means to embrace or to hold in your arms.

Here's the character breakdown:
大志 (taishi) ambition; aspiration.
を (o) particle
抱く (idaku) to embrace; to hold in the arms (e.g. a baby); to hug; to harbor/harbour; to bear (e.g., a grudge); to entertain (e.g., suspicion); to sleep with; to sit on eggs.

Note: Because this selection contains some special Japanese Hiragana characters, it should be written by a Japanese calligrapher.