The objective of Tagore's poem is to increase understanding of what worship of Isvara means.
The summary verse of B.Gita - verse 18.66 starts as 'sarva dharmaan parithyajya'. This is taken to mean that there is a God person (Sri Krishna) who is waiting for one to surrender. It is fine to think that way since a person feels some limitations and feel like 'surrendering' all his limitations to a God.
As one grows in understanding one will question why this verse is in Chapter 18 and not earlier. The entire B.Gita can be dispensed with by saying this in the beginning. There are some 'acharyas' who preach this 'easy' solution.
Verses like those of Tagore can make people think which is why shared it with members here.
I also wonder why is there a slOka (# 18.67) immediately after this which states :
(summarising) " You should never disclose this to someone who is devoid of austerities, one who is not devoted, one who is adverse to spiritual advancement and one who is envious of Lord Krishna".
Why exclude someone who is not austere?
Cant devotion come after hearing the Bhagwad-GeetA?
What is meant by spiritual advancement? Everyone gangs up on Sravana whenever he even mentions the word "spiritual"
and lastly who is that person who can be envious of Lord Krishna (may be some asurA or a rAkshasA)?
Does BG mention anywhere about going to temples and why should Tagore write about not going to temples to bring out the message of BG?