虎穴に入らずんば虎子を得ず (こけつにいらずんばこじをえず): nothing ventured, nothing gained; you will not get the tiger cub without entering the tiger's den

nothing ventured, nothing gained; you will not get the tiger cub without entering the tiger's den

You cannot take the cub without walking into the tiger's den. Said to steel someone before a risk that has to be taken whole rather than hedged.

A Japanese proverb (ことわざ)