The advertising slogan of China Pacific Insurance Company is a drop of water in normal times, and the Pacific Ocean is owned in difficult times. Which Chinese proverb does this correspond to?

This is a classic and true advertising slogan of Pacific Insurance Company. It can be understood that if you can inject a drop of water (take out an insurance) in normal times, then when you are in trouble, you will have Pacific Ocean ( A lot of help)

Extended reading: How to buy insurance, which one is better, and step-by-step instructions to avoid these "pitfalls" of insurance