'Unless' in the Bible

Do two men walk together unless they have made an appointment?

Does a lion roar in the forestwhen it has no prey?Does a young lion growl from its lairunless it has captured something?

Does a bird swoop down into a trap on the ground if there is no bait? Does a trap spring up from the ground unless it has surely caught something?

Surely the Lord God does nothingUnless He reveals His secret counselTo His servants the prophets.