«مَا رَأَيْتُ مِنْهُ وَلَا رَأَىٰ مِنِّي»
I did not see from him, nor did he see from me, what modesty would leave unmentioned.
The complements of seeing remain unstated to avoid explicitly naming something that the setting of modesty calls for concealing. The audience can understand the direction of the meaning without the object being voiced.
Discreet omission does not necessarily aim to make all meaning unknowable. It communicates by allusion while avoiding an expression unsuited to the occasion. This differs from generalization and mere economy.