After attaining Jnana and Siddhi, one may set rules and and regulations aside. But a Sadhakas life should be subject to strict discipline.

Nirmalananda Swami

 (from "Swami Nirmalananda - His life and teachings"):

Question: Sri Ramakrishna was a great spiritual power. Yet it is said, he could not accept food touched by some and gifts offered by some. How can it be explained? 

Nirmalananda Swami: I can’t say how it can be explained. To be able to explain it, we have to attain a position higher than his. He himself could not account for it. He did not label men as good or bad - He simply could not accept food touched or offered by people whom we call bad. Something within forbade him from accepting it; that is all he knew, not the why of it. Once, when Swami Saradananda was coming to Dakshineswar with sweet-meats sent by his mother as an offering, a relative of his also sent some cakes. Sri Ramakrishna ate the sweets sent by the Swami’s mother. He could not touch the other offering. He did not allow even his household devotees to eat it. All such offerings, he used to give to Swami Vivekananda. The other disciples suspected it was the Master’s partiality towards Norendra and they decided to eat some. Once, Swami Brahmananda tasted a bit, and suffered for it. He lost all peace of mind - Sri Guru Maharaj laughed and said “Well served —you didn't heed my words.” 

Swami Vivekananda brought all sorts of low and wicked people to Dakshineswar, but Rakhal Maharaj brought only good pious people. For Sadhakas, Rakhal is the example, not Norendra. A Sadhaka should observe these rules. Otherwise, he will have to suffer much. After attaining Jnana and Siddhi, one may set them aside. But a Sadhakas life should be subject to strict discipline. Sankaracharya also has said : “Oushadhavat prasniyat ”, one should take food as medicine, not to fatten oneself. Swami Vivekanandawas born a Siddha. He had not to practice Sadhana to attain any Siddhi. If Sadhakas disregard the rules and regulations, they are liable to fall.