This section is from the "May I Answer That?" book, by Sri Swami Sivananda. Also available from Amazon: May I Answer That?
Yes. You must have sincerity, earnestness, faith, vigour and vitality. You must proceed cautiously, step by step. Over-exertion should be avoided. The Yogic practices will give you success if you observe Mouna, Mitahara and practice of Japa and meditation. Success in Asan, Pranayam, etc., depends upon the constitution. There are different exercises to suit different people.
If you want vigour and vitality, become a true Brahmachari from this very moment. Be established in mental and physical Brahmacharya. Take Sattvic food. Develop Vairagya. Study my book "Practice of Brahmacharya". You will find practical exercises there for keeping up Brahmacharya.
Sexual thoughts, worldly desires, unholy ideas, sexual Vasanas, anger, vanity, hypocrisy, egoism, greed, jealousy, etc. will not arise in your mind if you have Chitta Suddhi. You will have no attraction for sensual objects. You will have sustained and lasting Vairagya. Even in dreams you will not entertain evil thoughts. You will possess all the virtuous divine qualities such as mercy, cosmic love, forgiveness, harmony and balance of mind. These are the signs to indicate that you have attained Chitta Suddhi.
This is the sarcastic statement of a curious, passionate, impure foreigner of little understanding or intelligence. When a foreigner tries to learn the Tamil or the Hindustani language, he first tries to pick up some vulgar words. This is his curiosity nature. Even so, the curious foreigner tries to find out some defects in the worship of symbols. The Linga is only the outward symbol of the formless being, Lord Siva.
Linga means mark' in Sanskrit. It is a symbol which points to an inference. When you see a big flood in a river, you infer that there must have been heavy rains the previous day. When you see smoke, you infer that there must be fire. This vast world of countless forms is a Linga of the omnipotent Lord. The Siva Linga is a symbol of Lord Siva. When you look at the Linga, your mind is at once elevated and you begin to think of the Lord.
There is a mysterious power or indescribable Sakti in the Linga to induce concentration of the mind. Just as the mind is focussed easily in crystal gazing, so also, it attains one-pointedness when it looks at the Lingam. That is the reason why the ancient Rishis of India have prescribed the Lingam for being installed in the temples of Lord Siva.
To a sincere devotee, the Linga is not a block of stone. It is all radiant Tejas or Chaitanya. The Linga talks to him, makes him shed profuse tears, produces horripilation and melting of the heart. It raises the devotee above body-consciousness and helps him to commune with the Lord and attain Nirvikalpa Samadhi. Lord Rama worshipped the Siva Linga at Rameswar. Ravana, the learned scholar, worshipped the golden Linga. What a lot of mystic Sakti there should be in the Linga!
The light of consciousness manifesting out of Sadasiva is, in reality, the Siva Linga. From Him all the moving and unmoving creations take their origin. He is the Linga or cause of everything. In Him the whole world merges itself finally. The Siva Purana says: "Pitham Ambamayam Sarvam Sivalingascha Chinmayam". The support or Pitham of all is Prakriti or Parvati; and the Linga is Chinmaya Purusha, the Effulgent Light which is self-luminous. The union of Prakriti and Purusha, of Parvati and Siva Linga, is the cause of the world.
The union of Linga with Yoni is a representation of the eternal union between the static and the dynamic aspects of the Absolute Reality. This represents the eternal spiritual communion of the paternal and the maternal principles from which all the phenomenal diversities have originated. This is an eternal communion of the changeless Being and the dynamic Power or Sakti from which all changes flow.
The lower sexual propensities in the aspirants are eradicated by this sublime conception. The spiritualization and divinization of Linga and Yoni help the aspirants to free themselves from sexual thoughts. All base thoughts gradually vanish by entertaining this lofty idea. All sexual relations in this world are spiritualized as the manifestations of the ultimate Creative Principle, of the eternal self-enjoyment and self-multiplication of Lord Siva in and through His Power or Sakti.
 
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