What is the spiritual path that people go through... Is it for moksha? And why does it have so many restrictions like.. no sense enjoyment, no desires etc...
Our scriptures had observed :
आहारनिद्राभयमैथुनञ्च एतत् सामान्यं पशुभिर्नराणाम्। धर्मो हि एको ह्यधिको विशेषो धर्मेण हीनाः पशुभिः समानाः॥ meaning that taking food, sleep, fear and sex are common among men and animals. The only difference is Righoutness or Spirituality.
So Spirituality is what makes a man different from an animal.
What is the essence of Spirituality? The smallest list our scriptures give is :
अहिंसा सत्यमस्तेयं शौचः संयममेव च meaning non-violence, Truthfulness, Non-stealing, Purity and Control of the senses are what make men different from the animals.
Upto this, there is no mention of God even!
Most of us need God to come out of fear and manifest the features of Spirituality in life with absolute perfection.
God says in the Gita (Chapter 7, sloka 16):
Four classes of people of virtuous deeds adore Me: the afflicted, the seeker of Knowledge, the seeker of wealth[any material gain] and the man of Knowledge.(Translation by Swami Gambhirananda)
So He Himself makes it clear who worships Him and why.
I think the above answers your queries.
(Reference: Jnaniguru by Nigamananda Paramahamsa, Halisahar Saraswata Math)