This section is from the "May I Answer That?" book, by Sri Swami Sivananda. Also available from Amazon: May I Answer That?
We should develop our material and physical powers and get to the same peak of progress, power and comfort as the Western nations before we can dabble in philosophy and the like.
Two types of workers, social and religious, are necessary in this world. Social workers will work in their own fields of activity. Religious workers will carry on special propaganda and dissemination of spiritual knowledge. A carpenter has his own field of work and an electrician has his own field. You cannot ask a carpenter to do the work of an electrician and the electrician to do the work of a carpenter. Social, economic, political and industrial development and constructive work in those directions are very necessary. These should not be ignored.
But, religion only can save people. Without religion, man is nowhere. Even those who work in the other fields cannot turn out good work without disciplining themselves, without having a spiritual basis, without undergoing a religious training, without practicing Ahimsa, Satyam and Brahmacharya. Leaders who are selfish and corrupt spoil the society. They fight for their own superiority and power.
Bread, butter, jam and nice biscuits cannot give you everlasting peace. Comforts are enemies of spiritual life and peace. They pull a man down. After all, man wants very little on this earth. You will think of God only when you are in adversities. What is wanted is spiritual wealth which is inexhaustible.
That work which removes the ignorance of man and gives him happiness can eradicate human sufferings in toto and give him eternal happiness. That work is spiritual propaganda. That work is the dissemination of Bhakti and knowledge of Yoga and Vedanta. It is the crowning glory of human activities. This is the greatest Yajna or Yoga. This is Jnana Yajna, the highest of all Yajnas.
India alone possesses the supreme divine wealth. Even the richest people of the different parts of the world come to the Himalayas to practice Yoga, to seek the guidance of Rishis, seers, Yogis and sages and to acquire this imperishable wealth.
Happiness does not come from wealth. The Western nations are quite restless despite their enormous wealth. From this we can infer that spiritual life alone can give real, everlasting peace and happiness.
As you would see the material objects with the help of a material instrument in the form of the eye, the Yogi would see subtler objects through the help of subtler instruments. Except in the plane of intuition, in all other lower planes, there exists a subject-object relationship as far as cognition is concerned. The only thing is: the instrument used in perceiving the object should be of the same material of which the object of perception is made.
For further grasping of the exact vision of the Yogi, you yourself should become one.
 
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