Highlights from Nampil̤l̤ai's Vyākhyānam as documented by Vadakkuth Thiruvīḍhip Pil̤l̤ai
Katturaikkil - One may verily experience Bhagavān and become wholly immersed in Him, yet find it impossible to articulate such an experience. The term katturaikkil (from kattu - experience, and uraikkil - if it is possible to explain) reflects this profound truth.