Though his staff is often confused by the way he runs the office, I've found that there's 'method in his madness'.
Her friends told her the idea was pure/sheer 'madness', but she went through with it anyway.
He suffered a series of tragedies that nearly drove him to 'madness'.
(..) ...and tediousness the limbs and outward flourishes, I will be brief Your noble son is mad Mad I call it, for to define true madness, what is it but to be nothing else than mad? But let that go - More matter with less art - Madam, I swear I use no art at all (..)2015 Hamlet
(..) Or to the dreadful summit of the cliff that overlaps his base into the sea'? And there assumes some other horrible form which might deprive you of your reason... ...and draw you into madness. Think of it - It waves me still, I'll follow it - You shall not go, my lord - Hold off your hand (..)2015 Hamlet