In the Tractatus, Wittgenstein mentions the following:
"3.03 Thought can never be of anything illogical, since, if it were, we should have to think illogically."
"3.032 It is as impossible to represent in language anything that 'contradicts logic' as it is in geometry to represent by its coordinates a figure that contradicts the laws of space, or to give the coordinates of a point that does not exist."
Later he states
"6.54 My propositions are elucidatory in this way: he who understands me finally recognizes them as senseless, when he has climbed out through them, on them, over them. (He must so to speak throw away the ladder, after he has climbed up on it.)"
So first he states that all thoughts and language are logical, since an (ideal) language can't represent anything illogical. Presumably his own writing is clear and grammatically correct and so it is logical. He then claims that his own propositions are senseless. So his own writing is logical but senseless.
- What is then, the difference for Wittgenstein (and later the Logical Positivists) between an illogical statement and a senseless statement?