18. The sensible man does not try to diagnose his own disease and prescribe medicine for himself by reading medical books. In case of disease, a doctor's advice should be sought. In the same way, if after reading many books and scriptures one proceeds to choose for himself a partic�ular spiritual discipline, his mind may become confused and troubled by doubts and misgivings, progress may be inter�rupted, and waste of effort and even harm may result. The reason is, that the various scriptures contain divergent or even con�tradictory directions and methods, suited to aspirants of different temperaments and capacities, and different stages of life. It is, therefore, dangerous in many cases to decide for yourself what is exactly suitable for you. The Guru alone can direct you to the right path. That is why spiritual knowledge has to be acquired direct from the Guru. Know that the initiation and instructions given by him are the only path for you to follow. If you do the spiritual practices as enjoined by him unswervingly and with full faith in them and in him, you are sure to achieve success in course of time. In any event, never give up these practices and take to other methods under anybody else's advice. If you jump from one thing to another, the only result will be that you will lose your way and drift about, without gaining anything.
Source: Parmarth Prasanga -Towards The Goal Supreme- Swami Virajanandaji of Ramakrishna Math