“A divided mind is a mind on the path to destruction. If thine eye be single, thy life will be full of light.” – Anon.
“One cannot serve two masters.” – Matthew, 6:24
Ancient thinking seems replete with quotes encouraging us to focus on just one thing at a time. Concentrate the mind on the task in hand. It was after IBM coined the term “multitasking” to describe one of their computer processors in the 1960s that our ability to work simultaneously on multiple projects in parallel became a supposed virtue (McKeown, 2014, cited in Clear, 2015). The danger is that by switching repeatedly between projects you never really sink your mind into any of the projects at hand and so none of it ends up being your best work.
Working styles vary and multitasking might actually work for you, but if you are facing more than one deadline you might benefit from focusing on just one thing at a time and really giving it your all.