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"The affairs of the world will go on forever. Do not delay the practice of meditation." - Milarepa
Upvote:1
Possibly Pupphavagga or Lokavagga or Jesusvagga.
178. Better than sole sovereignty over the earth, better than going to heaven, better even than lordship over all the worlds is the supramundane Fruition of Stream Entrance.
Upvote:1
There are some (famous) lines in the Maha-parinibbana Sutta (DN 16)
Therefore, Ananda, be islands unto yourselves, refuges unto yourselves, seeking no external refuge; with the Dhamma as your island, the Dhamma as your refuge, seeking no other refuge.
And
Behold now, bhikkhus, I exhort you: All compounded things are subject to vanish. Strive with earnestness!
These don't quite match, "The ways of the world will never be finished"; but they are a good (maybe the best) match for, "find your own salvation with diligence".
There are various English translations, e.g. it's often translated "diligence" instead of "earnestness".