Hieroglyphs mean "Meditation and Tea are the same", which has a deep philosophical meaning, stating that when we drink tea we should think about it and enjoy the present moment - that's same when we meditate - we are contemplating the present moment without going back in past or in future. By being present and aware of situation our thoughts get clear and we are able to see things as they are, without changing it or challenging it.
Usually hang in a place where family members and friends gather together, can be a kitchen, dining room, restaurant or bar, etc.
Characters are written in KaiShu style (WangXiZhi).
Wang Xizhi (Wade-Giles: Wang Hsi-chih; 303–361) was a Chinese calligrapher traditionally referred to as the Sage of Calligraphy (書聖), who lived during the Jin Dynasty (265–420). He is considered by many to be one of the most esteemed Chinese calligraphers of all time, especially during and after the Tang Dynasty, and a master of all forms of Chinese calligraphy, especially the running script.
The Emperor Taizong admired his works so much that the original Preface to the Poems Composed at the Orchid Pavilion was said to be buried with the emperor in his mausoleum.
In addition to the esteem in which he is held in China, he has been and remains influential in Japanese calligraphy.