Verse 42

तावत्प्रक्षाल्यते धातुर्यावद्धेमैव शिष्यते ।तावदालोक्यते सर्वं यावदात्मैव लभ्यते

In plain words

Just so far is the ore washed, until gold alone remains; just so far is everything looked into, until the Self alone is attained.