The Yogasutra of Patanjali is one of the ancient sources to understand what it means to follow the path of realisation.
The Yogasutra of Patanjali
Blog
Darlegung des Dhammas
Gedanken zur Unendlichkeit und zur Leere
Der edle 8-fache Pfad zum Heil …
brahmajnānāvalīmālā
In this work attributed to Sri Sankara the characteristics of the person who has realized that he is Brahman are described.
Recognise the aspect of immortality
Dhamma&more... 