Human nature: tendencies that never change.
For example, babies and adults have a tendency to get increasingly irritable when we are tired.
The wonderful thing about human nature is that it can enlighten tendencies of yourself and others.
And once you understand your tendencies you can determine if your human nature aligns with your values.
If you value patience that may cause you to be more conscious about avoiding situations where you are very tired and have a tendency to snap.
And if such a situation is unavoidable remind yourself to have extra patience.