essence of that rare (difficult to acquire/learn) vĕdham —

 chants of vĕdham which is difficult to grasp —

meanings of vĕdhāntha —

are those who save the vĕdhās from others and from those who give wrong meanings —

that is, the four vĕdhas, —

of vĕdham which is eternal, authorless, distinguished in comparison to the other pramāṇams such as perception and inference, and is most trustworthy, and reminds sentient entities about good and bad, and is in the form of instructions/commands, —

 vĕdhams- —