In this expression, quanquan (拳拳) symbolises the action of closing the fist or the fists and designate the idea of sincerity, determination. Fuying (服膺) symbolise the idea of wrapping in one's chest or keeping in his heart.
Another interpretation of this expression, in a much more litteral sens, would be "the real boxing remains in our heart", wich means that the martial art should not be linked to the external form but to the intention that lead it.
Calligraphy of 7 traditionnal expressions by Wang xiangzhai
A famous calligraphy by Wang xiangzhai shows seven traditionnal expressions he was especially found of :
Zhongxiao ren'ai (忠孝仁爱), Xinyi heping (信义和平), Quanquan fuying (拳拳服膺), Yiquan zhengzong (意拳正宗), Duanlian shenti (锻炼身体), Hongyang guocui (弘扬国粹), Zhenxing zhonghua (振兴中华).
The translation of those four caracters phrases could be the following (personnal translation) :
Respect the elder and be charitable, be loyal and pacific, be sincer in your heart. (So is) the orthodox (ancestral) school of yiquan, (wich allows to) train your body, (so that) the best of the country will developp and extend (in order to) revivify the chinese nation.
To be "sincer in your heart" (quanquan fuying) is a human quality that is much beyond the martial art practice. But still, this expression, in an another way is nothing else but the teaching of Wang xiangzhai on the use of the intention in the practice.
The chinese caracter used for intention shows a standing man (between ground and sky) on a mouth, the whole reposing on an heart. The ancient signification beeing the possibility of formulating (represented by the mouth) the material as well as the immaterial (man between ground and sky) in an affective way (the heart).
The yi caracter in its ancient graphy (calligraphy from the author)
The yiquan / dachengquan founder was used to say that the intention is the general and the force, his soldier.
So the intention (yi) comes from the heart (xin), commands the energy (qi) wich leads the force (li).
This corresponds to the three others of the six harmony, the three internal harmonies.
(to be continued...)