Why should they be considered?
Not only are they so numerous that no intellect could deal with them, but they have, since with regard to them there is no difference of opinion, no place in any practical discussion at all.

If a ton of stone is to be placed on a piece of framework, men may reasonably discuss whether the framework is strong enough to bear it, or whether material is not being wasted in making it stronger than necessary.

What will happen without an additional girder?
Or what will happen if we take two girders away?
Will the stone fall or not?
These questions belong to the domain of practical reasoning because to take a girder away, or else introduce fresh ones, lies within the power of the disputants.

But no practical men would think of complicating the discussion by calculating what would happen if they suspended the action of gravitation, in which case the stone would need no support whatever; for to suspend the action of gravitation is within the power of nobody.

If two men are debating in the middle of the night at midsummer whether there is enough oil in the lamp to keep it alight till sunrise, they are debating a question of a strictly practical kind: for it rests with them to put in more oil or not.