Purity of conduct forms the purity of the mind. The purity that one acquires by ablutions in sacred waters is considered as inferior. Indeed that purity which originates from knowledge, is considered as the best.
वृत्तशौचं मनःशौचं तीर्थशौचमतः परम्। ज्ञानोत्पन्नं च यच्छौचं तच्छौचं परमं स्मृतम्॥