"One look tells you why this stock keeps soaring. It's no wonder it surged from $400 to $640 earlier this year as profit projections ramped up. Growth and technology fund managers have to own this stock the same way lots of consumers have to own iPhones, iPads, and Macs," he writes.

"Apple will still grow iPhone and iPad sales that surprise, especially in Asia. And next year is going to have investors chomping at the bit to see 'Apple TV' sales projections," he adds, suggesting that the share price won't be on the decline for long.

Cook's recommendation is to buy Apple as soon as the stock dips to around the $500 mark. If you are already holding Apple stock, he recommends you hang on to it.

Cook thinks Apple's stock could head to new all-time highs above $650 in the next six months. He even hints at the potential of $750.

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