Clout
古之善為士者 微妙 玄通 深不可識 In the old days, the best influencers were a bit mysterious, strangely reasonable, definitely inscrutable. 夫唯不可識 故強為之容 In fact, being so inscrutable is what made them so compelling.
豫兮若冬涉川 猶兮若畏四鄰 They were careful, like a winter crossing, and reserved, like respectful neighbours. 儼兮其若容 渙兮若冰之將釋 They were as serious as they were polite, but chill, like melting ice. 敦兮其若樸 曠兮其若谷 混兮其若濁 They were as true as timber, as wide as valleys, as messy as mud.
孰能濁以靜之徐清 孰能安以久動之徐生 Who else would quietly clean up by calming us down, and who else would quietly steady us by keeping us moving?
保此道者 不欲盈 These days, people like that don't care about clout. 夫唯不盈 故能蔽 不新成 In fact, they don't flex because their superpower is making a difference without making it about themselves.
Notes
There's a lot of variation in this one between different versions, especially in the 兮若 sayings. Words have double meanings, definitions specific to Daoism, and entries in the Yijing, so it's obscure, like the inaudible, invisible, ineffable influence it describes.
I've been trying to wrap my head around 盈, 蔽 and 新成 for a long time, and the only constant I've found is that 盈 contrasts 徐 of the previous saying, and it's something like the difference between patience and good will (徐) and the arrogance and idealism of power (盈).