This section is from the "May I Answer That?" book, by Sri Swami Sivananda. Also available from Amazon: May I Answer That?
To find out a real Guru who may sincerely look after the disciple is a very difficult task in this world. It is quite true. But, to find out a true disciple who may sincerely follow the instructions of a Guru is indeed a very, very difficult task in this world. Have you thought over this point? Do not use your reason too much in the selection of a Guru. If you fail to get a Guru of the first-class type, try to get one who is treading the spiritual path for some years, who has right conduct and other virtuous qualities, and some knowledge of the scriptures. Just as a Sub-assistant Surgeon will be able to attend on a patient when the Civil Surgeon is not available, so also, the second-class type of Guru will be of great help to you in the absence of a first-class Guru.
The glory and liberty of a Sannyasin can hardly be imagined by the householders. If there is a change inside the mind, there must be a change outside also. Wearing the ochre-coloured cloth, the orange robe, is very necessary for one who has a changed mind. Due to the force of Maya or habit, when the senses go to the objects of enjoyment, the moment you look at the coloured cloth you wear, it will remind you that you are a Sannyasin. It will give you a kick and save you from vicious actions. It has got its own glory and advantages. A real Sannyasin only can cut off all connections and ties and completely get rid of Moha. His friends and relatives will not trouble him. The robe is of great service when one appears on the platform for preaching. It has got its own sanctity in the minds of Hindus. The common people will receive the ideas more readily from Sannyasins.
You have viewed the topic from a thoroughly wrong angle. The very premise for your theory is wrong. Immortality does not pertain to the physical body. Once born, a man has to die, i.e., cast off the physical body. That state in which you freely enjoy the continuity of life without entering the cycle of birth and death is immortality. Unless you identity yourself with that Cosmic Self which transcends all limitations of space and time, you cannot enjoy immortality. To identify and realize that Immortal Self, you should conserve and preserve every bit of energy within you. There is only one energy within us which is able to do the different functions under various forms. As you expect a long life to the machines you use by keeping them in a good condition and doing the minimum work without allowing them either to rust or to waste, you should maintain this body well-conditioned and have its life prolonged by conserving the energy within. Without the body, how can you probe into the higher planes?
Please go through my translation of the Srimad Bhagavad Gita. Practice the sort of renunciation advocated by it. It does not require you to renounce family life. You have to live in the world and learn through the world without becoming one of the world. Your duty is to maintain the household, but not to get attached to it. Then and then alone will you have that purity of mind which will enable you to progress on your path towards the attainment of perennial peace, joy and bliss.
Enough of your wrong notions. Awake and understand your true imperishable nature. Behold your true immortal, all-pervading Self and rest in it drinking the nectar of immortality. Follow my instructions. You will be a thoroughly changed personality with inner spiritual strength. Have faith and sincerity. Success is yours. Thou art That.
 
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