How and when does imagination overcome reason and fear?

E.g. When a child is afraid of scary monsters under his/her bed, he can imagine the good and happy heroes that will fight and defeat the scary monsters. This overcomes fear.

Another form of imagination to overcome reason is hope. E.g. A person hopes that one day he will recover and be able to walk again despite doctors saying he will never walk again. That hope/determination makes one never give up trying till one walks again. Therefore such an imagination is determination to overcome scientific reasoning.  

the anwser is went creeping down the river again, across the wide lonely marshes to the sea.

i longed to go with them out into the world to seek my fortune in foreign lands—africa, india, china and peru!

and, dreaming of the lands i had never seen, i'd sit on there, watching till they were out of sight.

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good luck: )