Expand, Release, Collect, Tighten; Movement and Stillness Support Other (展放收緊，動靜圓撐) from The Real Theory of Baguazhang (八卦掌真理篇) by Jiāng Róngqiáo (薑容樵)

展放收緊，動靜圓撐

展放收緊是指動作姿勢的開合而言，開的姿勢要舒展遠放，合的姿勢要內收外緊。動靜圓撐是指動中必須求靜，靜中又必須有動，動的極處就是靜的發源，靜的極處就是動的起端，這動和靜必須相互循行，又相互含蓄。

薑容樵

"'Expand, release, collect, tighten' refers to the movements of opening and closing the posture. In opening a posture one must unfold and release far, in closing a posture one’s interior must tightly restrain the exterior. 'Movement and stillness support each other' indicates that within movement there must be stillness and that within stillness there must be movement; the extremity of movement originates stillness, in the same way the extreme stillness is the origin of movement; both the mutual support of movement and stillness are necessary to a smooth performance, the mutual aspect is implicit."

From the book Bāguàzhăng Practice Method (八卦掌練習法), by Jiāng Róngqiáo (薑容樵), based on the translation by Joseph Crandall