Our nature itself is happiness. Only when we are diverted from this fact we feel unhappy. For example, someone shouted at you. Now you are thinking about this questioning its reasonableness … propriety ..etc … finally you forget all about this and settle down—now are reverted to your original nature of happiness.
You can only divert your attention from happiness, and your happiness can never be destroyed because you are made of happiness and other qualities. You are an individual which is from indivisible, Latin [in + dividuus “divisible”, from divido “divide”. Individual is all about your immaterial substratum on which body is sustained. This substratum is indivisible, minuter than the minutest, not composed of parts, cannot be destroyed. This applies to God who is also an individual made of happiness and other qualities. The only difference: among many individuals, one would be supreme.