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Gita is perhaps the only holy book that has not been edited (not even a word) since it was sung by Lord Krishna on the battlefield of Kurukshetra.It is the same it was 5000 years ago.Many holy books had to be altered to suit the modern scientific era.In fact the constitutions of the modern day countries are amended and rewritten at regular intervals.That only means Gita has stood the test of time.Gita is as valid today as it was 5000 years ago and will continue to remain valid until the end of humanity.
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The more important reason is that it is sung by the Supreme Power.It is popularly believed that Lord Krishna sang Gita in the verse form to Arjuna on the battlefield.If any of you have been reading Gita regularly they will find that the name of Lord Krishna does not appear anywhere in Gita.It is always 'Shree Bhagawanuwach' (God speaks).When Lord Krishna started to recite Gita to Arjuna He ceased to become Krishna. He became Yogeshwar (the Supreme Power).Many of you might question what is the difference between the Supreme Power and Lord Krishna? Lord Krishna was avatar (God reincarnate) while Yogeshwar was God Himself.That is the vital difference.At no point in Gita is Krishna mentioned by name.When God decides to reveal Himself in full glory to Arjuna the word used is Yogeshwar.After the battle of Kurukshetra was over one day Arjuna asked Lord Krishna to sing Gita again and reveal His full form. Lord Krishna replied 'I did not sing Gita.It was Yogeshwar who sang it. It is not possible for me to sing Gita again however dear you are to me.'.
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Gita is sung in verse form and not written in literary sense.I think Yogeshwar must have been a great psychiatrist.He must have known that it is easier for my children to remember my word in verse form than in the literary form.
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Gita does not lay stress on action at the cost of inaction or viceversa.There is a balance everywhere.There is a balance between Gnan (knowledge),Karma (action) and Bhakti(devotion).