Words or speech in the form of mantras is an integral part of the yajna. The performer of the yajna should be fully focused on what he is doing. If he talks about anything else then images connected to those words will also be present in his mind. They will corrupt the mantras and the effect of the mantras.
Astrology
Atharva Sheersha
Bhagavad Gita
Bhagavatam
Bharat Matha
Devi
Devi Mahatmyam
Ganapathy
Glory of Venkatesha
Hanuman
Kathopanishad
Mahabharatam
Mantra Shastra
Mystique
Practical Wisdom
Purana Stories
Radhe Radhe
Ramayana
Rare Topics
Rituals
Rudram Explained
Sages and Saints
Shiva
Spiritual books
Sri Suktam
Story of Sri Yantra
Temples
Vedas
Vishnu Sahasranama
Yoga Vasishta