Narendra asked:

How to feel and reach God by knowledge? by work/ duty? by devotion?

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To whom exactly are you addressing your question? To philosophers? To theologians? Of course you
realize that for philosopher who do not held theist views your question is irrelevant.
Moreover,philosophers who do share theist views are not unanimous in answering this kind of
question.

There is no unanimity among theologians of various religions either. Furthermore one could not find
unanimity even among Christian theologians. Opinions differ according to denominational theories
and points of view. Not all theologians accept that it could be possible to feel and reach God by
knowledge alone. Not all theologians accept that you could feel and reach God by work/ duty. Not all
theologians accept that it could be possible to feel and reach God by devotion alone.

The question of Divine Grace (the supernatural assistance of God bestowed upon a rational being
with a view to his/ her sanctification) has been the subject of much controversy. Nevertheless it
seems to be some kind of unifying point as well, because almost all appear to admit the need for
Grace in order to feel and reach God.

Your question looks like a simple one. In fact, it refers to various complicated theological
controversies. Some of them led to schisms, heresies and the division of the Christian Church.

Jean Nakos