The greatest of these is love, but love is closely followed by hope and faith.
Every human being is called on every day to exercise faith to some degree.
You can't live without faith. When you wash your face in the morning, you exercise faith. You turn the faucet, and you have faith that water will flow from the spigot. When you drink a glass of water you exercise faith. You drink the water, and you trust that the water company has treated it, and made it safe to drink.