Relationship between man and soul
Scriptures: outside and on surface。
Inner experience and practice: There are teachers who teach us the knowledge. There are Masters to embed us the practice, like Buddha, like Jesus, like Mohammed, search Google for spiritual Masters
Inside or Outside
Going to India is a spiritual dream of seekers. There could be many, he/she can try Yogananda center for example: Yogananda center in India: http://www.anandaindia.org/centres-groups/index.php Spiritual practice is the key, not really the places. If he/she is passionate on this, they need to know and compare, they can try meditation on both the inner Light and the inner Sound
Spiritual vs. science
Science could be purely objective, Spirituality could be fully subjective. But this is old theory, at 21st century, they are interlaced.
See the example on the water experiment