crēdō ut intelligam

(idiomatic) tears (drops from the eyes)

(informal) "not knowing even a millimeter": completely ignorant in regards to something

British Indian Ocean Territory (an archipelago and overseas territory of the United Kingdom in the Indian Ocean)

British Antarctic Territory (an overseas territory in the Antarctic administered by the United Kingdom, and also including the South Orkney Islands and South Shetland Islands)

(literally) know the other side and yourself, a hundred battles will not be perilous

(idiomatic, proverb) be quick on the uptake, understand the whole situation from just a few clues

(figuratively) a narrow world view based on limited experience

an ordinary person cannot understand the ambitions of a great man