Pray write instantly, and let me understand it—unless it is, for very cogent reasons, to remain in the secrecy which Lydia seems to think necessary; and then I must endeavour to be satisfied with ignorance.
There are no more uses of "cogent" in the book.
Show samples from other sources
It is difficult to decide because both sides offer cogent arguments.
He makes a cogent argument, but the premises are flawed.