English to Japanese Art/Literary Religion Japanese Zen Proverb

Dear Colleagues:

Although I´m an English Spanish translator, I have a very unusual requirement, I need to translate this Zen Proverb into Japanese, it will be painted as a mural painting in a Karate school. I have no knowledge of Japanese, but I understand that this proverb can be written in Kanji symbols.

It is very important that this proverb is properly written, since this school will receive several Japanese visitors during the following months.

I will be very grateful for your suggestions about this unusual requirement.

Thanks a lot,

Juan Mera