[源远流长 / 源遠流長, yuán yuǎn liú chángㄩㄢˊ ㄩㄢˇ ㄌㄧㄡˊ ㄔㄤˊ] lit. source is distant and the flow is long (成语 saw); fig. sth goes back to the dim and distant past; a lot of water has flowed under the bridge since then#26940
[任重道远 / 任重道遠, rèn zhòng dào yuǎnㄖㄣˋ ㄓㄨㄥˋ ㄉㄠˋ ㄩㄢˇ] a heavy load and a long road; fig. to bear heavy responsibilities through a long struggle (cf Confucian Analects, 8.7)#27922