Moses said this to Israel right before they had to walk into a land full of people bigger and stronger than them, not to people who had it together, but to people who had every reason to be afraid.
Notice the order. First be strong and courageous, then the reason: because God goes ahead of you and will not abandon you. Courage here isn’t the absence of fear, it’s trusting a promise more than you trust the fear.
“He will neither fail you nor abandon you” is covenant language, a commitment being sworn, not a feeling God was having that day.
So if you’re walking into something today that feels bigger than you, that’s not a sign you’re alone in it. It’s exactly the moment this verse was written for.