Choose the right dream and pursue it the right way

I am reading "Shine: Using Brain Science to Get the Best from Your People" by Edward M. Hallowell, M.D. He writes:"Taken by itself, ‘Follow your dream’ could be the most dangerous advice ever given." Why? Because we get little guidance on which dreams to pick, just "sentimental advice to pursue a dream and the Calvinist command to work hard." The result: unhappy workers who turn bitter because of a mismatch between talent and job. A better way, he says, it to pick the right dream — one that suits you well enough that you will want to work hard and "if it doesn't come true, you will feel glad and proud that you pursued it anyway." He says that, if you select wisely, the pursuit of the dream becomes "the great reward, the love of your working life." His thoughts remind me of the great poem "Ithaca" by Constantine P. Cavafy, “As you set out for Ithaka/hope the voyage is a long one,/full of adventure, full of discovery. . . . /Keep Ithaka always in your mind./ Arriving there is what you are destined for./But do not hurry the journey at all./Better if it lasts for years,/so you are old by the time you reach the island,/wealthy with all you have gained on the way. . . ." Good advice from the doctor and the poet.