The last 4 engines if prakriti mayay that pathi has given to pasu to help pasu realise truth are
1. Manasu - helps decipher / understand
2. Puthi - helps know good or bad
3. Ahankaram - helps seek what is in it for me
4. Sitham - un sullied memory. According to avvaiyar god is shown / seen in Sitham ( சித்த்த்தின் உள்ளே சிவலிங்கம் காட்டி )
When one is able to have mastery over the 20 + 4 engines it is said G
