誰言寸草心報得三春暉 is the last line of a famous poem. It is perceived as a tribute or ode to your parents or mother from a child or children that have left home.

The poem was written by Meng Jiao during the Tang Dynasty (about 1200 years ago). The Chinese title is “You Zi Yin” which means “The Traveler's Recite.”

The last line as shown here speaks of the generous and warm spring sunlight which gives the grass far beyond what the little grass can could ever give back (except perhaps by showing its lovely green leaves and flourishing). The metaphor is that the sun is your mother or parents, and you are the grass. Your parents raise you and give you all the love and care you need to prepare you for the world. A debt that you can never repay, nor is repayment expected.

The first part of the poem (not written in the characters to the left) suggests that the thread in a loving mother's hands is the shirt of her traveling offspring. Vigorously sewing while wishing them to come back sooner than they left.
...This part is really hard to translate into English that makes any sense but maybe you get the idea. We are talking about a poem that is so old that many Chinese people would have trouble reading it (as if it was the King James Version of Chinese).

道 is the character “dao” which is sometimes written as “tao” but pronounced like “dow” in Mandarin.

道 is the base of what is known as “Taoism.” If you translate this literally, it can mean “the way” or “the path.”

Dao is believed to be that which flows through all things and keeps them in balance. It incorporates the ideas of yin and yang (e.g. there would be no love without hate, no light without dark, no male without female.)

The beginning of Taoism can be traced to a mystical man named
Lao Zi (604-531 BC), who followed, and added to the teachings of Confucius.

More about Taoism / Daoism here.

Note that this is pronounced “dou” and sometimes “michi” when written alone in Japanese but pronounced “do” in word compounds such as Karate-do and Bushido. It's also “do” in Korean.

Alternate translations and meanings: road, way, path; truth, principle province.

Important Japanese note: In Japanese, this will generally be read with the road, way, or path meaning. Taoism is not as popular or well-known in Japan so Daoist/Taoist philosophy is not the first thing a Japanese person will think of when they read this character.

See our Taoism Page