But just as much as it is easy to find the differential [derivative] of a given quantity, so it is difficult to find the integral of a given differential. Moreover, sometimes we cannot say with certainty whether the integral of a given quantity can be found or not.
![But just as much as it is easy to find the differential [derivative] of a given quantity, so it is difficult to find the integral of a given differential. Moreover, sometimes we cannot say with certainty whether the](http://cdn.quoteddaily.com/images/johann-bernoulli/but-just-as-much-as-it-is-easy-to-find-the-differential-derivative-of-a-given-quantity-so-it-is.jpg)