It's said that the characters for the I Ching hexagrams are not typical old Chinese, so that they could be an import from another language. Well, there were Indo-European tribes all around, and the kings Wen and Shun are said to be from them. So there's a scholar recently who took the reconstructed ancient pronunciation of ZZSS and made the case for them being Indo-European. 'Ch'ien', 'The Creative', could easily have been 'gen', the same 'gen' we have in 'generate' 'genetics', etc. (so the 'gn' in 'sign', and 'cognition'). Then I'm in the Sanskrit dictionary and notice 'li'. 'Li' is the Chinese name for the 'fire/clinging' trigram, though there are no such meanings of 'li' in my Ancient Chinese dictionary. Well, look at that, in old Sanskrit, 'li' was 'cling' and 'lip' was 'flame'.
Meanwhile, a possible meaning for line 6 of the hexagrams: Oaths. Once oaths are abolished, the rest of moral agency gradually rolls back. Oaths were the completion of moral agency, at shich it was no longer moral agency, the will having saturated out. This would connect it to line 3, a lower relation to oaths, as the gears and linkages in an environment without trust.