What does 'to pass from dream to grander dream' mean?

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CUET English Language Comprehension Passage 6 — practice the complete quiz, review flashcards, or try a random question.

Progress in life depends a good deal on crossing one threshold after another. Some time ago, a man watched his little nephew try to write his name. It was hard work, very hard work. The little boy had arrived at an effort threshold.     Today he writes his name with comparative ease. No new threshold confronts him. This is the way with all of us. As soon as we cross one threshold, as soon as we conquer one difficulty, a new difficulty appears, or should appear. Some people make the mistake of steering clear of thresholds.     Anything that requires genuine thinking and use of energy, they... Show more

What does 'to pass from dream to grander dream' mean?