It is important to have a notebook to write things that God shows us, that we may later look back in the book to remember those things.
Oh that my words were now written! oh that they were printed in a book! Job 19:23
Write thee all the words that I have spoken unto thee in a book. Jeremiah 30:2
What thou seest, write in a book. Revelation 1:11
Write this for a memorial in a book. Exodus 17:14
Now go, write it before them in a table, and note it in a book, that it may be for the time to come for ever and ever: Isaiah 30:8