Human ability is an unequal ...

Human ability is an unequal match for the violent and unforeseen vicissitudes of the world.
 Hugh Blair

Quotes from the same author

In the eye of that Supreme Being to whom our whole internal frame is uncovered, dispositions hold the place of actions.
 Hugh Blair
Those who are learning to compose and arrange their sentences with accuracy and order are learning, at the same time, to think with accuracy and order.
 Hugh Blair
As the primary end of History is to record truth, impartiality, fidelity and accuracy are the fundamental qualities of an Historian.
 Hugh Blair