Verse 14.5 of the Bhagavad Gita states:

सत्त्वं रजस्तम इति गुणाः प्रकृतिसंभवाः।
निबध्नन्ति महाबाहो देहे देहिनंव्ययम्॥

“Sattvaṁ rajas tama iti guṇāḥ prakṛti-sambhavāḥ
Nibadhnanti mahā-bāho dehe dehinam avyayam”

This verse addressed to Arjuna, describes the three modes of material nature (guna) – sattva (truthfulness), rajas (dominance), and tamas (ignorance). These three modes arise from the material nature and bind the embodied soul to the body.

The above teaching comes from Krishna who can be considered as Guru/guide. In ancient tradition of India, Guru is often given the status of God and Krishna is often called, “Lord”.

As a side note, it is sometimes wondered that if there is just one ultimate truth, then why there are so many ancient Gods. As stated in the previous paragraph, Guru is often given the status of God and there can be different Gurus for different people even if there is one truth. It is like light having different colours but after all it is just the light.