Gurudev, when one gets initiated into Sanyasa (renunciation), then one is asked to burn off the Janeuu (sacred thread worn across the shoulders), and it is considered that one cremated oneself. What is the actual secret behind this?
No, it does not mean that. See, just like a snake sheds off its old skin, in the same way this ritual symbolizes that one should drop off everything from the past and be firmly established in the present.
Burning the thread at the time of Sanyasa means that one no longer needs to shoulder any responsibilities or duties. The reason behind wearing the thread is to remind oneself about the responsibilities one has to fulfill. Once a person has fulfilled all responsibilities and commitments, then he takes off the sacred thread. This also means one become centered and at peace. They do not have any more desires to be fulfilled.