सत्त्वानुरूपा सर्वस्य श्रद्धा भवति भारत। श्रद्धामयोऽयं पुरुषो यो यच्छ्रद्धः स एव सः ॥

sattvānurūpā sarvasya śhraddhā bhavati bhārata śhraddhā-mayo ‘yaṁ puruṣho yo yach-chhraddhaḥ sa eva saḥ

The faith of each is shaped to his own nature, O Bhârata. The man consists of his faith; that which his faith is, he is even that.

In plain words: Krishna says each person's faith matches their own nature, Arjuna (called Bharata). A person is made of their faith: whatever they truly believe in, that is what they become.