At the moment, I can't add a particular excellent Ven. Thanissaro quote. I will offer this: I had the privilege to visit Wat Metta outside San Diego a time or two. On my first visit, I spoke with Ven. Thanissaro very briefly, as I had spent some time in Thailand, and greeted him initially in Thai. In any case, he presents as a combination of university dean, scholar/monk, and strict parent to the young monks and novices in his sangha. He's pleasant, but serious. The word "gravitas" comes to mind...this man defines gravitas. ("Gravitas was one of the Roman virtues, along with pietas, dignitas and virtus. It may be translated variously as weight, seriousness and dignity, also importance, and connotes a certain substance or depth of personality.")
Over time, as I hung out with some of the younger Bhikkhus (that's a story in an of itself...what an excellent group of young men), I felt as though Ven. Thanissaro opened up a bit, and listened in on our conversations about Dhamma, and even a discussion about Dhamma as it is discussed on this site. Again, gravitas. He's just such a compelling person to be around.
In any case, I was just one of many visitors to Wat Metta, and he was busy with other matters. People come and go to Wat Metta. A bit later in the day, after I had observed him with his serious demeanor, and his scholarly approach to discussing matters of interest, I went into the Sala to sit and do prostrations. There was Ajaan Thanissaro, sitting on the floor with some of the Thai folk from around San Diego that came to Wat Metta to help assemble a Thai calendar. Sitting with the Thai members of the community, he seemed a different man...smiling broadly, speaking in Thai, and joyfully helping assemble the calendars. I understood that this great man, this man of such scholarship, such gravitas, such merit, was happiest sitting with his beloved Thai people. I left Wat Metta that day believing him to be one of the most interesting and outstanding people I've ever met.
I also left that day with huge box of his books...a gift from Ven. Thanissaro to my farang Bhikkhu friends and their English Dhamma book library at Wat Sri Boen Ruang in Chiang Mai. Every book that he publishes, every single book, is freely given. http://www.watmetta.org