This section is from the "May I Answer That?" book, by Sri Swami Sivananda. Also available from Amazon: May I Answer That?
As one advances in spiritual Sadhana and attains a greater and greater degree of evolution day by day, by regular and unremitting practice of the Yoga of Synthesis, the clouds of doubts, delusion and interrogation disperse by themselves. As the sun rises, the mist disappears. Even so, as you progress in the spiritual path by the Grace of Guru and God, all the intricate problems of life and death dissolve themselves into the ever-abiding Truth of existence. The only duty of man is to intensify the inner purity by graded integral Sadhana. Whenever doubts, troubles and the like arise, repeat any one of the following Mantras: Om Sri Rama Saranam Mama or Om Sri Krishna Charanau Saranam Prapadye or your Guru Mantra. There is no room for doubts to crop up on the attainment of God-realization, as the seeker is no longer the seeker, but God Himself.
There is no use of praying to the Lord by fits and starts or every now and then. Do Japa and meditation regularly without any break even for a single day. Just as you do not give up tea and meals even for a single day, and just as you do no forget them too, so also, do not forget Sadhana whatever little you can¾ and then only take your meals. This is a sure and potent way of goading and compelling the mind to penetrate itself deeply and unavoidably into the spiritual practices. By following this procedure, you get used to doing Sadhana regularly at least for the sake of the meals that is necessarily to succeed, in spite of the unwillingness of the mind.
When the mind undergoes phases of transition in enjoying the charm of the world, it cannot concentrate upon itself and direct the gaze within itself. Pull the reins of the mind back towards itself as it goes out hither and thither. Continue this process several times in a day. When you develop strength of will to realize the Lord by intense efforts, progress automatically sets in. Read the Second Chapter of the Gita with meaning. You will have a clear understanding of the remedy for setbacks in Sadhana.
No doubt it helps a person if he takes to Sadhuhood or Sannyasahood with the permission of his parents and other closely related ones; or else, it is likely to affect the interests of the individual. But there is absolutely no harm if he takes to the Nivritti Marga or the path of renunciation when there is a very high degree of Vairagya.
No man in the world is related to any other from the absolute metaphysical standpoint and whatever relationship exists between one and the other is, after all, by dint of Karmas performed previously. Human beings associate and dissociate themselves just as two pieces of wood in a flowing river. When the time ripens, everything resolves itself into One. This makes it clear that one is at liberty to take Sannyas at any desired moment without incurring any inequity, provided one has the staunch Bhav that nobody is related to anybody in this world, and that everybody stands by himself to seek his goal.
 
Continue to: