Ritam is that which is changeless in the three periods of time - past, present and future. That is true wisdom. That which undergoes change is marakam and that which is changeless is Tarakam.

Understand the principle of Tarakam with the grace of Sadguru and find the difference between eternal and ephemeral. Know the secret of Tarakam (Soham) which Jivatma (individual soul) repeats without a break in all the three states of Jagrat (waking), Swapna (dream) and Sushupti (deep sleep) (SSS Vol.35, p.349)