Very valuable lessons. Thank you.
อริยสัจ = อริยะ [ariya] + สัจจะ [sacca]
Perhaps, we should understand the term 'ariyasacca' in details. From Digital Pali Reader dictionary:
Ariya (adj. -- n.) [Vedic ārya, of uncertain etym. The other Pāli forms are ayira & ayya] 1. ;(racial) Aryan D ii.87. <-> 2. (social) noble, distinguished, of high birth. -- 3. (ethical) in accord with the customs and ideals of the Aryan clans, held in esteem by Aryans, generally approved Hence: right, good, ideal. [The early Buddhists had no such ideas as we cover with the words Buddhist and Indian Ariya does not exactly mean either. But it often comes very near to what they would have considered the best in each]...
Sacca (adj.) [cp. Sk. satya] real, true D i.182; M ii.169; iii.207; Dh 408; nt. saccaŋ truly, verily, certainly Miln 120; saccaŋ kira is it really true? D i.113; Vin i.45, 60 J i.107; saccato truly S iii.112. -- (nt. as noun) saccaŋ the truth A ii.25, 115 (parama˚); Dh 393; also: a solemn asseveration Mhvs 25, 18. Sacce patiṭṭhāya keeping to fact, M i.376. -- pl. (cattāri) saccāni the (four) truths M ii.199; A ii.41, 176; Sn 883 sq.; Dhs 358. -- The 4 ariya -- saccāni are the truth about dukkha, dukkhasamudaya dukkha -- nirodha, and dukkha -- nirodha -- gāminipaṭipadā. Thus e. g. at Vin i.230; D ii.304 sq.; iii.277 A i.175 sq.; Vism 494 sq.; VbhA 116 sq., 141 sq. A shortened statement as dukkha, samudaya, nirodha magga is freq. found, e. g. Vin i.16