Earning passive income from a portfolio of dividend shares is one of the joys of life. With such high-profile backing, could this amazing FTSE 100 dividend stock be worth considering by those wanting to start generating passive income relatively quickly? On this basis, 1,000 shares bought today (1 August), at a cost of £9,220, would produce dividend income of £570 over the next 12 months. With over £300bn of assets under management, unpredictable markets remains an ever-present threat to the group's dividend. Due to its size, Standard Life might not be agile enough to adapt to the emergence of new competitors with a lower cost base.