This is what I said to myself today immediately before noon.
...don't punish yourself if your output is less than what you had planned. Life is full of beautiful inconveniences that keep us from achieving our short-term goals. Remind yourself that you can make up for your deficit tomorrow and turn off the computer for the night. Writing + Thinking for writing is a wonderful, yet sometimes, very hard thing to do. Often it is very easy to not "make the time" to write and nobody is going to motivate you. You have to motivate yourself(most of the time). It is an extraordinarily rewarding pursuit. Yet sometimes it can be extremely challenging as well. It is just putting words down on paper and you have been doing this since the age of four(?). So don’t worry about anything and just write. The only way to get good at it, as with anything else, is to actually do it.