You may be very, very interested in a subject or field of study. You may even be very interested in the Bible. Or theology. Or Church History. But the fact is, you are not a scholar of those fields until and unless you care enough to read the primary sources of those fields of study. Ad fontes isn’t just a fun saying, it contains within itself the very heart and soul of accurate, decent, meaningful research.
Where Ad fontes is absent, so is worthwhile scholarship. Scholarship dependent on translations is always and forever lacking.