O King, the Personality of Godhead, being very much pleased with Lord Brahmā because of his nondeceptive penance in bhakti-yoga, presented His eternal and transcendental form before Brahmā. And that is the objective goal for purifying the conditioned soul.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
आत्मतत्त्वविशुद्ध्यर्थं यदाह भगवान् ऋतम् । ब्रह्मणे दर्शयन् रूपमव्यलीकव्रतादृतः
ātmatattvaviśuddhyarthaṃ yadāha bhagavān ṛtam | brahmaṇe darśayan rūpamavyalīkavratādṛtaḥ
SB 2.9.4