There are two words here: one is called Theory, the other Practice.

It is well to have them both, for one is nothing without the other; but still the latter is the better.

Now the former means, to understand the cause and principle of a work; the latter, to be able to perform it: as, for instance, in regard to a quagmire; for there are many who know what should be done with a quagmire and yet do it wrong, because they are not able to put their knowledge into practice.

Many, on the other hand, are skillful in doing, but do not know what ought to be done; and thus they too may make bad work of it, for there are many kinds of quagmires.

But we at the agricultural school learn both words.