Gurudev used to write addressing young aspirants:
You must be very correct, very punctual, very regular. You should discipline yourself rigidly. Otherwise, you cannot attain the highest, the Realisation. It is not an easy task. Happy-go-lucky type easy temperament is no good in spiritual pursuits. Have you noticed how correct, how strict, how disciplined are the soldiers in the army? They have to stand in the parade according to the unit or battalion they belong to. They have to be absolutely spic and span. They do polishing of the shoes and brass by themselves. Even if a single button is dull, the inspecting officer spots the soldier and puts him into quarter-guard, and he will have to do fettling duty. They are always fighting fit, trim and clean, neat and tidy, because they have been drilled into this sort of correctness, precision and training. When an ordinary soldier is required to be so disciplined, so correct, so punctual, so regular, then what to say about you, O aspirant! A spiritual aspirant has to be even ten times more strict, regular, punctual, correct, well-disciplined. A soldier fights to win a battle, whereas an aspirant has to win the kingdom of heaven, win Kaivalya Moksha. Therefore, never give leniency to your mind.
If anyone who is living in Sivananda Ashram complains of lack of guidance, he must be a lazy person, he has no interest in his own welfare. I have given everything necessary for a Sadhaka in my 300 books. If a Sadhaka is seriously interested in his own good, he should go through these books and he will have no more any doubts. He will never have any hesitation in proceeding with his Sadhana. Everything necessary for a spiritual aspirant is given in these books. Study them. If you have got any doubts after a sincere study, do come to me and ask.