This classical Chinese text is too hard; I can't understand it.
Tips
usage
古文 and 文言文 (wényánwén) overlap heavily. 文言文 stresses the grammatical register (Classical Chinese grammar, as opposed to 白话 modern vernacular), while 古文 emphasizes the historical/literary dimension, writings from antiquity through Tang-Song prose.
history
The Tang-dynasty 古文运动 (Classical Prose Movement), led by Han Yu and Liu Zongyuan, rejected the ornate parallel prose (骈文) of the Six Dynasties in favor of plainer pre-Qin style, which is why 古文 today often connotes Tang-Song prose specifically.