This poem of Robert Frost seems to be linked with our inner world more than our outer world. Many teachers in the school days teach this story as an inspirational story. However, only a few of the people knows the depth of these four lines. It may take years (ERA) for someone to understand the true and in depth meaning of it. It can not be understood until and unless it is taught by a perfect master and then observed and seen by the self.
In the poem, the poet talks about illusion. He says worldly affairs seem to be very attractive. Illusion is very attractive, it has a lot of depth means an unintelligent person can not understand it and third it leads to horrible darkness.
However in the second line it is clear that the human being has promised to GOD before he came on the planet earth. Though many people either do not remember or do not want to remember after being involved and attached in this illusive world.
In the third line the poet says that he has to go inside his own until a lot of distance till the time unstoppable Death comes.
And in the end at the fourth line, he reassures his commitment towards the promise, he made to GOD.
SUMMARY IN SHORT : EACH AND EVERY ONE SHOULD PROSPER FOR THE PATH OF TRUTH, BLISS OR THE PATH OF IMMENSE LIGHT. THERE MAY BE HURDLES IN BETWEEN, BUT BE FOCUSED AND CONTINUE MOVING FAST AND DO NOT STOP TILL THE TIME YOUR FINAL DESTINATION ARRIVES.