Nature in this world consists of many things including the earth, water, wind, fire, mountains, forests, rivers, rocks, stones, sand, pebbles, gold, silver, metal, zinc, copper, good, bad . Nature has two types:- Nature which is created by other factors. Sankhara (body formation) is nature which can get old and die as it is created by other factors. Whereas Nature which is Dharma is not created by other factors because Dharma is emptiness which is Nibbana. This is like a Buddha Pali saying :- 'Sabbe Dharma Ananta’ because Lord Buddha has found the principles of truth and has left his findings for us to follow. Once we follow his footsteps, we can only find happiness. It will be sooner or later.
This is similar to a planting of fruit tree. We will get some fruits sooner or later. It is a question of time only. If the soil where we plant that fruit tree is reasonable, we will get reasonable amount of fruits. If the soil is very fertile, we will get lots of fruits. On the contrary, if the soil is bad, we will not get any fruits which means it is the products of our karma which has not yet given results fully.
Therefore, we should be proud in our endeavour and continue carrying out good karma ‘ Sankhara Anicca ’ means impermanent according to its natural conditions. ‘Sabbe Sankhara Dukkha ’ means all Sankhara is Dukkha and impermanent as it cannot escape from being born, to get old, to suffer pain, and to pass away. Sankhata Dharma is ‘ Sabbe Dharma Ananta ’ means Sankhata Dharma and Asankhata Dharma or Asankhara has no self.
This principle is some times called ‘Trilakhana - The Three Signs of Being or Common Characteristics’. It was Lord Buddha who found these principles and left them for us in the ‘Vinaya -(Discipline) - Sutta’.