And if this quantity is greater than this quantity, if we take their difference, we get unnegative value. So what that means is a biological reaction that takes place inside our body or inside our cells increases the entropy of the universe only if the gifts free energy is actually a negative value. And that means when the gifts free energy is a negative value, our reaction under that particular condition, at that particular temperature, is a spontaneous reaction. So spontaneous reaction that increases entropy of the universe under this particular temperature will always have a gift free energy that is a negative value. And that's what we mean by a spontaneous reaction. So a reaction is only spontaneous as that particular temperature.