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Value Points : everything comes to an end one day what is most important is our relationship with our dear ones. the poet strengthens this idea that riches don't matter what is more valuable is his love for his friend.
Detailed Answer :

It is a well-known truth that materialistic
things don't really last. All signs of worldly power, glory and grandeur fade away with the passage of
time. Kings and Princes get their monuments erected so as to be remembered by the future
generations. But all gold-plated monuments, memorials and statues eventually
fall into utter neglect, decay and deterioration. They all meet the dust as
they fail to outlive the
ravages of time. In stark contrast to this are our relationships. They are
immortal. They don't get
destroyed by time. Rather they are strengthened with the passage of time. The
poet is also of the opinion
that riches don't matter much in this world. What is more valuable is his love
for his friend. Their love will live longer than any man-made monuments.
Neither death nor war will be able to destroy his memory. Hence, it is our love and relationships which
matter the most in this world. All other things come to an end one day. 

Like we have seen in the poem NOT MARBLE NOR THE GLIDED MONUMENTS that the poet wants to give his friend a gift which can be remembered to the world forever he says to his friend in the poem that the gift which I am given you is the gift which was or will not be given by any friend it means that if a king makes any monument or any castle the time will come that no one will remember it but this poem which I am going to write will always with people memories whatever the situation and we can see that the poet was correct because after many and many decades also we can see the poem which the poet write for his friend HOPE YOU ABLE TO UNDERSTAND