The phrase "and emphasize the essential" is correct and usable in written English.
You can use it when you want to highlight the most important aspects of a topic or argument.
Example: "In our discussion, we need to focus on the key points and emphasize the essential to ensure clarity."
Alternatives: "and highlight the key" or "and stress the important".
CERC builds environmental leadership and emphasizes the essential role of the natural world in sustainable development through the synthesis of research, applied research and education.
The Art and Social Justice Initiative is pursuing a wide-ranging constellation of workshops, seminars, projects, and publications that emphasize the essential nature of interdisciplinary collaboration within the School of Art and the international Yale community.
Writers on the subject of creativity and innovation invariably emphasize the essential primacy of the creative impulse itself.
Kang and Hustvedt (2014) emphasize the essential role of trust, involving consumer perceptions of transparency, for obtaining a more complete understanding of consumer loyalty behavior.
The existence of vigorous Jewish communities at times persecuted, as in Poland in 1648, but in places such as Amsterdam secure, prosperous, and creative only serves to emphasize the essential fact: Europe and Christendom were interchangeable terms.
The Symbolists' attempt to emphasize the essential and innate qualities of the poetic medium was based on their conviction of the supremacy of art over all other means of expression or knowledge.
All these studies emphasize the essential role of NO and it appears feasible that soon an NO releasing chemical will be available for clinical testing to stimulate arteriogenesis.
The composite viewpoint, in which a figure is depicted simultaneously from the front and in profile -- a pose already perfected in the third dynasty Relief from the Tomb of Akhethotep -- was a product of Egyptian artists' desire to emphasize the essential over the ephemeral, to provide the most complete and comprehensive view of the human figure.
"Time to Leave," in the end, explains very little, choosing instead to emphasize the essential paradox that an individual's life is never complete and always over too soon.
