Nothing remains constant, all things are in a state of advancement or decay.

There is rarely a chance for life to remain constant.

Relationships don't remain constant, but are in a constant state of evolving, either positively or negatively.

There are few things that will remain constant over the long run.

What are accepted as beliefs or understandings comes to dictate the fabric for how future is defined.

Assuming others have the same comprehension and understanding about a certain issue can prove erroneous.