笃 (dǔ) — Density · How Much Is Actually There · Weight That Accumulated

Load a horse and the first thing to change is not its speed but its footfall — each step lands harder and stays down longer. 许慎 built the character's definition on that footfall: 篤，马行顿迟也，从马，竹声 — the horse's step has gone heavy, its pace has fallen off — with 马 carrying the sense and 竹 supplying nothing but a reading. The two have come apart at the front rather than the back — 竹 took the retroflex initial Mandarin developed, 笃 kept the plain d- — but in the language 许慎 was describing they were close enough for one to spell the other, so the bamboo on the roof now points at something the word has never had anything to do with. Notice what the definition is not about. The slowness is in there, plainly, but it is being read as a symptom rather than asserted as the subject, and nothing in the entry says whether the animal is strong or weak. What is being measured is an amount — what it has on its back — through the only evidence of the load a bystander actually has.

The commentators settled on one word for it: 厚, thick. 毛传 puts that gloss on one of the character's oldest surviving appearances, 笃生武王 in 《诗经·大雅·大明》, and 郑玄 spells out what it is doing there: 天降气于大姒，厚生圣子武王 — heaven sent its breath down on the mother, and what came of it was a son produced thickly. The gloss held for two thousand years. When 朱熹 reached 君子笃恭而天下平 in the last chapter of 《中庸》 he wrote 笃，厚也 once more, then had to say what thick reverence could possibly consist of, given that the chapter's whole subject is virtue nobody can see working. That is the character's whole working life in one line. It fastens onto something else and returns that thing's density, carrying no content of its own — as an adverb on a verb in 笃信, believing hard enough to act from it, and 笃学, studying past the stage of being assigned; as a predicate on a noun in 情笃, an attachment thick enough that an outsider thought it worth writing down.

The proof that the word measures rather than approves is that it works just as well on things nobody wants more of. 病笃 says an illness has crossed into serious, and 李密 wrote 刘病日笃 — heavier by the day — of the grandmother he was refusing an imperial post to nurse. Chinese never needed a second character for that direction, because 笃 was never a compliment in the first place. It returns a quantity and stays silent on whether the quantity is good news, and the noun beside it decides.

The phrase Chinese reaches for when a marriage is being described from outside is 伉俪情笃 — the couple's attachment, measured and found thick. It belongs to the third person. 伉俪 is a formal honorific for somebody else's husband and wife — 贤伉俪 on the wedding invitation, never a word either of them would use of themselves — and the assessment that follows it is what a biographer, an obituary or a toast concludes about a pair. Friendship works the same way: 交情甚笃 and 相交甚笃 are what the record says about two people, and someone else is always doing the saying. That is worth knowing before brushing the character. It is not the word for declaring what you feel, and it does not sound like one. It is the word for what other people have worked out, which makes a gift about the only way of getting it said to the person's face.

The other thing to know is that nothing is 笃 on the day it starts. A friendship has to have run a while before anyone measures it; 笃信 is not the conviction you took up last month; even 病笃 is never the first symptom. 孔子 put the character in exactly that company — 笃信好学，守死善道, hold your belief thick and keep studying, hold to the good way until you die — pairing it with 守死 because both are claims about what has survived exposure to time rather than about what was declared at the outset. A word with that requirement built into it cannot be claimed in advance, which is why it makes an odd gift at a wedding or a first job and a very good one at year thirty, when there is finally something to take a reading of. It should be said that 笃 does not hang alone as readily as 厚 or 德 do — its usual form on a wall is 笃行, 笃学, or somebody's 斋号 — and the single is for a wall with a history behind it.