Even with Alzheimer's, Ronald Reagan had his lucid moments while
President:

"A moment I've been dreading. George (Vice President George H.W. Bush)
brought his neer-do-well son around this morning and asked me to find the
kid a job. Not the political one who lives in Florida (future Gov. Jeb
Bush). The one who hangs around here all the time looking shiftless. This
so-called kid is already almost 40 and has never had a real job. Maybe I'll
call Kinsley over at The New Republic and see if they'll hire him as a
contributing editor or something. That looks like easy work..."

-- Ronald Reagan in his recently published diaries, May 17, 1986.
_________________________

Whoever undertakes to set himself up as a judge of
Truth and Knowledge is shipwrecked by the laughter
of the gods.

-- Albert Einstein