You could go to Gutenberg's combined collection of Twain's works and search for a phrase; I searched for "intelligent" there and found 99 occurrences.
http://www.gutenberg.org/ebooks/3200 - B. Clay Shannon

      From: Matthew Seybold <[log in to unmask]>
 To: [log in to unmask] 
 Sent: Monday, January 23, 2017 11:57 AM
 Subject: Re: a question regarding intelligence
   
There may be some variation upon this in the trial of Laura Hawkins in =
THE GILDED AGE or in PUDD=E2=80=99NHEAD, but this sounds to me like the =
lines from CHRISTIAN SCIENCE:

=E2=80=9CWe know exactly where to put our finger upon his insanity: it =
is where his opinion differs from ours=E2=80=A6The rule is perfect: in =
all matters of opinion our adversaries are insane.=E2=80=9D (Chapter V)
 =20

> On Jan 23, 2017, at 2:31 PM, Alan Kitty <[log in to unmask]> =
wrote:
>=20
> What about the courtroom scene in Colonel Sellers?  I don't recall if =
that s=3D
> cene also appeared in Gilded Age. These references assume of course =
that a "=3D
> book" also might include a play.
>=20
> Sent from my iPhone
>=20
>> On Jan 23, 2017, at 1:50 PM, JULES AUSTIN HOJNOWSKI =
<[log in to unmask]> wr=3D
> ote:
>> =3D20
>> The only book I can think of that had a court in it is the c. yankee =
one
>> And I brought up the text or that book on my computer and did a =
search and=3D
> =3D3D
>> that phrase does not come up in that book.  I do not recall any of =
his oth=3D
> e=3D3D
>> r works have a court scene in it.
>> =3D20
>> I am not sure that he wrote it. But I could be mistaken ;)
>> =3D20
>> Good luck.
>> Jules
>> =3D20
>> -----Original Message-----
>> From: Mark Twain Forum [mailto:[log in to unmask]] On Behalf Of Allen =
Brafma=3D
> n
>> Sent: Monday, January 23, 2017 12:12 PM
>> To: [log in to unmask]
>> Subject: a question regarding intelligence
>> =3D20
>> someone please remind me in which of Twain's work is the court scene =
where=3D
> =3D3D
>> the narrative voice says something along the following lines:
>> =3D20
>> =3D20
>> a person considers another person intelligent if that other person =
says so=3D
> m=3D3D
>> ething that is in agreement with the first person's own thinking
>> =3D20
>> =3D20
>> I thank you all in advance for your attention to this
>> =3D20
>> =3D20
>> Allen Brafman