Acharya Prashant explains that writing and expression are necessary for those who are affected by the world. If one is truly untouched by the internal and external noise, like a person passing through a chaotic crowd without a single stain, then silence is appropriate. However, for the vast majority, the world leaves deep impressions, scars, and 'tattoos' from head to toe. He emphasizes that our physical traits, desires, and habits are often not our own but are products of biological evolution and social conditioning, likening them to stains from a messy festival. By observing and expressing these influences, one can achieve purification and detachment.