A Foundation (n.) that stands on nothing is a bad foundation.
A Foundation (n.) must be taught us as such — something must be taught us as a foundation.
A Foundation (n.) at the rock bottom of my convictions is almost carried by the whole house.
The Foundation (n.) are what we keep forgetting to go down to: we don't put the question marks deep enough.
A Foundation (n.) is forgotten: one does not go down to it, and one does not put the question marks deep enough.
A Foundation (n.) of all operating with thoughts is formed not only by logic but by propositions of the form of empirical propositions.