Excerpt from <span class="chinese-post-title">述郭雲深先生言</span> Report of Guō Yúnshēn Sayings in <span class="chinese-post-title">拳意述真</span> Boxing Concepts Explained Authentically

十一則

練拳術不可固執不通。若專以求力。即被力所拘。專以求氣。即被氣所拘。若專以求沉重。即為沉重所捆墜。若專以求輕浮。神氣則被輕浮所散。所以然者。練之形式順者。自有力。內裏中和者。自生氣。神意歸於丹田者。身自然重如泰山。將神氣合一化成虛空者。自然身輕如羽。故此不可以專求。雖然求之有所得焉。亦是有若無實若虛。勿忘勿助。不勉而中。不思而得。從容中道而已。

郭雲深

"When practicing boxing arts, you must not have so much determination that it obstructs you. If you are obsessed with seeking to have strength, you will get jammed up by it. If you are obsessed with seeking to have energy, you will get clogged up by it. If you are obsessed with seeking to be heavy, it will weigh you down. If you are obsessed with seeking to be light, your spirit and energy will wander off.
Therefore the way to go about these things is to practice the postures smoothly, and then naturally there will be strength. When there is neutrality within, it will naturally produce energy. When your spirit and intention return to your elixir field, your body will naturally be as heavy as Mt. Tai. When your spirit and energy merge into one and transform into emptiness, your body will naturally be light as a feather.
Thus you must not obsessively seek, even though there may be something to be gained through the seeking. Look upon that something as if it is nothing, treating its substantiality as insubstantial. Neither forget about it nor assist it. Do not strive for it and you will hit the target. Do not fixate on it and you will obtain it. Being patient and balanced is all you need."

Excerpt from the translation by Paul Brennan, to be found in the Brennan Translation blog.