“On the whole, at least in the author's experience, the preparation of species-specific antiserum fractions and the differentiation of closely related species with precipitin sera for serum proteins does not succeed so regularly as with agglutinins and lysins for blood cells. This may be due to the fact that in the evolutional scale the proteins undergo continuous variations whereas cell antigens are subject to sudden changes not linked by intermediary stages.”
![“Although the way ahead [for immunology] is full of pitfalls and difficulties, this is indeed an exhilarating prospect. There is no danger of a shortage of forthcoming excitement in the subject. Yet, as always, the highlights of tomorrow are the unpredictabilities of today.” quote by Cesar Milstein](https://sms4smile.com/quotes/img-quotes/0b5/cesar-milstein-56606_danger_although-the-way-ahead-for-immunology-is_2757068.jpg)
![“T]he church is not a place. It's not a building. It's not a preaching point. It's not a spiritual service provider. It's a people - the new covenant, blood-bought people of God. That's why Paul said, 'Christ loved the church and gave himself up for her' (Eph. 5:25). He didn't give himself up for a…” quote by Mark Dever](https://sms4smile.com/quotes/img-quotes/7a4/mark-dever-3175_blood_t-he-church-is-not-a-place-it-s-not-a-bu_3297.jpg)
