The core of the disciple training method is that a person's thought enlightenment should be high, but it need not reach the extent of a Saint. For Ma Lin, this was a normal standard, yet some people simply couldn't achieve it.
As society advanced further, it was estimated that the difficulty of the disciple training method would decrease. Then, the number of people willing to train according to its principles would increase, as would the number of those who succeeded.
The advantage of the disciple training method was that the more followers it had, the lower the training threshold would be, and the greater the benefits.