Despite knowing that we tend to forget things, some of us still insist on not writing things down. Yes, admittedly, our mind has probably an unlimited storage space but that does not mean that data can be retrieved as easily as storing them all.
We need to understand that having things written down and captured saves time and energy to be able to direct them to do things that matter to you. Also, it gives you a sense of confidence in recalling things that dates back in time.
Each day is an exciting and a new learning experience for those who enters them with an open mind. There will always be something to learn from and share with. Therefore it is important to write things down. Note it somewhere. As long as you capture that thought and are able to retrieve it whenever you want, then you win.