Great quality print and inspiring motto for this Bunbufuki Tenugui.
The 4 Kanji read as follows:
文(bun) for literature, culture, writing, language
武(bu) for military/martial/warlike
不 (fu) to express negation like the "im" in "impossible" or the "un" in "unbelievable"
岐 (ki) for separation/division
This can be translated as: "“The martial and literary arts cannot be separated”"