Anas ibn Malik radhiyallāhu ‘anhu says, that the Prophet sallallahu alyhi wasallam said to him, 'O my son, if you can act in such a way that you spends your mornings and evenings without wishing anyone ill, then that is how you should always act.' He then added, 'O my son, this is my way. And anyone who loves my ways, love me. And anyone who loves me will live with me in Paradise.' Muslim
For example, to remain hungry for days on end is a Sunnah, but not everybody has the capacity to perform this. However, despite not being able to observe such actions, a person should still have love and admiration for them.