Frost may have meant this ironically, but how many of us feel unfocussed, creatively blocked, or restricted by our working environment?
If you wake up full of the joys of spring, but find that sitting at your desk soon has you distracted and unable to concentrate, you may have to reflect on why... and take steps to rectify the situation.
Because we spend so much time at work, it's important to find a way to create meaning and engagement, either through the individual work we do or in association with our colleagues, and this helps to maintain concentration. Actively seek to reduce external distractions like switching off your email alert, set goals (try the Five Minute Rule), make sure you stay hydrated, and if you don't have a pleasant view even a photo or picture of a beautiful rural landscape will help.
Someone estimated that we spend two thirds of our lifetime at work... so we may as well make it count.