5.131 If the truth of a proposition follows from the truth of another, this is expressed in the relations in which the forms of these propositions stand to one another; and we certainly do not need to put them in these relations first by combining them with one another in a proposition, but rather these relations are internal and exist as soon as, and by the fact that, these propositions exist.

So these internal relations express the fact that one proposition follows from another. But they are internal and do not need to be put into an explicit sentence or thought.