Discrimination. (Glossary for the Vahinis)
Viveka, the special gift to man, has to be employed to unravel the reality of the visible universe, its nature and validity. The fact of death is the prime cause which originates the problem, ‘Who am I?’. So, that fact ought not to be ignored as unworthy of attention. You should not flee from it in fear, for if you behave so, you land yourself on the first step towards Ajnana, stupidity, and plant in your mind the seedling of the tree of foolishness. You prop up the pillars of Maya. (SSVahini, p. 101)
Through exercising Viveka, i.e. discrimination between what is right and what is wrong, between what is permanent and lasting, and what is impermanent and fleeting, we should discipline our senses and control them. (TTFFW, p. 5)
Children believe your words when you say that the policeman will catch them or the ghost will beat them. They are full of fear, fortitude and faith! But having grown old and stuffed your heads with all kinds of doctrines and dogmas and theories and arguments, you have now to use your viveka (discrimination) and discover God the hard way. This I will tell you, there is no escaping it; all creatures have to reach God some day or other, by the long route or by the short route. (SSS Vol.1)
(See – Atma jnana, Sadhana)