Once again, time is the most valuable resource that you have, period. If you don’t believe this, just talk to someone who is dying of a terminal illness. They understand the true value of time more than anyone
The online Oxford Dictionary of Proverbs [OXP] gives two earlier cites with very different phraseology. The first cite is a version from Classical Greece “the most costly outlay is time” attributed to Antiphon. The second cite is from 1572 Discourse upon Usury, “They saye tyme is precious.” .
Unfortunately, many people waste their entire lives without even thinking twice about it. Unconscious of the fact that “time is money”, they end up wasting their money as well.