are things eternal? will things always remain the same?

recently, maybe not that recent tho, i joined a "B". the idealogy and philosophy of the B is very simple. people and process were also very simple, i used simple because i can't think of other "PC" word to replace.

over the years, evolution takes place i guess. the feeling is no longer the same, things have changed, people have changed. ideas no longer match the actions, actions no longer justifies for itselves. process have became more tedious. IC have also become different in terms of style and command.

it makes me wondering if someone sets out with a initial goal in mind will slowly change and evolved over the time period, change because the enviroment says that it cannot remain like that?

A started off with the X idealogy, however, it has change significantly over time becoming to idealogy Y and Z. therefore B came along and wanted to continue with the idea X and hopefully stayed like that. however, somehow or rather things started to change and B is becoming more and more like A. One day, B will definately become A.

This sets me off thinking, what i am today will i still be like that tomorrow? I realised my answer is NO. There will never be anything, especially when a human is in place, that will always remain as it is.

Things change, people change, action change, mindset change, weather change, everything change. Tell you a shocking truth. As a chemistry student, diamond is not eternal as well. Over a really long long period of time, diamond will also change to become carbon.

Tell me what is eternal?