Greetings Sthiracitta ,
It's not sutta based... it's from the Dhammapada commentary.
I don't remember off the top of my head which verse though, but I think it's one somewhere in the 80-100 range?
I'll try to remember to look it up once I've got ven K. Sri Dhammananda's translation back in front of me (even then though, it will be his paraphrasing of the commentary story, rather than a word-for-word translation of it).
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"The uprooting of identity is seen by the noble ones as pleasurable; but this contradicts what the whole world sees." (Snp 3.12)
"To argue with a person who has renounced the use of reason is like administering medicine to the dead" - Thomas Paine