Writing can make me anxious. Reading Marilynne Robinson's Gilead helps me to feel calmer, with its easy drift of words that you have to trust to take you where you need to go.
In the novel she describes the peacefulness of an ordinary Sunday:
‘It is like standing in a newly planted garden after a warm rain. You can feel the silent and invisible life. All it needs from you is that you take care not to trample on it.’
For me this applies to the process of writing. Everything you need is there - you just have to get out of your own way and allow it to blossom of its own accord on the page.