vital plane; but they can also indicate luminous or divine energies like the snake of Vishnu. The one you saw was evidently of this latter type – a luminous divine energy and therefore there was no cause for alarm, it was a good sign.Sri Aurobindo
Letters of Sri Aurobindo
11. Visions and Symbols
Fragment ID: 2068
About the snake you saw in your meditation – serpents indicate always energies of Nature and very often bad energies of the vital plane; but they can also indicate luminous or divine energies like the snake of Vishnu. The one you saw was evidently of this latter type – a luminous divine energy and therefore there was no cause for alarm, it was a good sign.