What does the speaker mean by “a dream deferred”?

Me i will give brainiest which excerpt from the passage most effectively contributes to the development of the theme that the bond between fathers and daughters is sacred and everlasting? '"may i not see the little one, sir, for a moment? ' it was his belief that mini was still the same." "i remembered the day when the cabuliwallah and my mini had first met, and i felt sad. when she had gone, rahmun heaved a deep sigh, and sat down on the floor." "this touch of his own little daughter had been always on his heart, as he had come year after year to calcutta to sell his wares in the streets." "he came close up to me holding out his offerings with the words: 'i brought these few things, sir, for the little one. will you give them to her? "'