Sankhya is so difficult to practice (as even stated by Krishna). But what is the mechanism involved in this path? Krishna explains this, which makes concepts very clear. After reading the same, anyone can infer why in today's world this is next to impossible.
"This Yoga is neither for him who overeats, nor for him who observes a complete fast; it is neither for him who is given to too much sleep; nor even for him who is ceaselessly awake."
(Chap 6 -verse 16)
"Yoga, which rids one of woe, is accomplished only by him who is regulated in diet and recreation, regulated in performing actions, and regulated in sleep and wakefulness."
"When the mind which is thoroughly disciplined gets riveted on God alone, then the person who is free from yearning for all enjoyments is said to be established in yoga."
(Chap 6 -verse 18)
"This yoga is difficult of achieving for one whose mind is not subdued; by him, however, who has the mind under control, and is ceaselessly striving, it can be easily attained through practice. Such is my conviction."
More about stability of mind as described by Krishna, which is pre-requisite to Sankhya. This is required even to reach the heights of Karmayoga. (The basic Karmayoga is to do actions by renouncing the fruits of actions. When we continue doing so, we automatically go onto the path as described below).
"The sage, whose mind remains unperturbed amidst sorrows, whose thirst for pleasures has altogether disappeared, and who is free from passion, fear and anger, is called one of stable mind."
(Chap 2 -verse 56)
"He who is unattached to everything, and meeting with good and evil, neither rejoices nor recoils, his mind is stable."
"When like a tortoise, which draws in its limbs from all directions, he withdraws his senses from sense-objects, his mind is stable."
"Sense objects turn away from him, who does not enjoy them with his senses; but the taste for them persists, this relish also disappears in the case of the man of stable mind when he sees the Supreme."
"Completely renouncing all desires arising from the thoughts of the world, and fully restraining the senses from all sides by the mind."
(Chap 6 -verse 24)
"Drawing back the restless and fidgety mind from all those objects after which it runs, he should repeatedly fix it on God."
(Chap 6 -verse 26)
"He should through gradual practice attain tranquility; and fixing the mind on God through reason controlled by steadfastness, he should not think of anything else."
"Therefore, Arjuna, he, whose senses are completely restrained from their objects, is said to have a stable mind."
(Chap 2 -verse 68)
"The self-controlled person while enjoying the various sense objects through senses, which are disciplined and free from likes and dislikes, attains placidity of mind."
"Arjuna, he who has given up all desires, and moves free from attachment, egoism and thirst for enjoyment attains peace."
