The Compendium of Caraka 3.7.4_5

3.7.4_5

viditaveditavyāstu bhiṣajaḥ sarvaṃ sarvathā yathāsaṃbhavaṃ parīkṣyaṃ parīkṣyādhyavasyanto na kvacidapi vipratipadyante, yatheṣṭamarthamabhinirvartayanti ceti//

Physicians, however, who know what ought to be known, determining after having thoroughly examined in every way whatever is to be examined to the extent possible, do not err anywhere, and achieve their desired aim.