You don't have to see a real snake to dream of a snake. Alpana says, what we dream is from memory. How do we start seeing the world if you have not seen anything similar to this anywhere? All our samskaras, they come from past lives. Where do those come from? From the lives before that? I can give you an answer.
Swami Sarvapriyananda teaches Chapter 6 (Verse 15) of the Bhagavad Gita. In this series of talks, Swami Sarvapriyananda unfolds the highest truths of Vedanta through the study of the Bhagavad Gita (The Song of God).