[raj]

For the past few weeks I have been learning to see and understand things from the correct perspective of annica, dukkha and anatta instead of anitiya (nonpermanent), dukkha and nonself.
But I was wondering where (in which suttas) and how and in what context the Buddha deal on the subject of anitiya or the constant changing aspect of ourselves and our surroundings.
Because anitiya or the constant changing aspects of ourselves and our surrounding is also an irrefutable factor of everything.