Is it necessary to write all the poems when writing a calligraphy work?

There are two ways to create:

First, write it all out. The form of creation needs to be designed first, such as banners or nave.

Second, choose some classic words to create. For example, you can write familiar sentences such as muddy but not dirty, clear but not demon, straight through and straight out, and you can write love lotus in the title.

These two situations often appear in calligraphy works and can be used.