Ludwig Wittgenstein in his Tractatus Logico-Philosophicus (ending with the significant number seven and calling for silence regarding things that can only be seen):
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.) He must surmount these propositions; then he sees the world rightly.
7. Whereof one cannot speak, thereof one must be silent.
[Note: Wittgenstein’s confidence in the abilities of language to portray reality is largely restored later in life as this passage indicates.]