Uva favorite word - Uncertainty

please please please help. I feel this is unclear! It's also shorter than the 250 words stated. do you think it will be fine?

Uncertainty for some acts as a gargantuan dark cloud whose only purpose is to obscure the sun, the bringer of light. For those who seek sureness, uncertainty arouses sensations of fear as it impairs vision, and hazes understanding. Unfortunately, this rejection of uncertainty hinders development of new or different opinions.

Uncertainty is a word that is very powerful to me. Instead of covering my eyes with rose-tinted glasses, I choose to accept the perplexities of the world to make way for growth and improvement. Pursuing a career in neuroscience requires this embracing of uncertainty since much of this thriving field has yet to be discovered, and so is uncertain. The first step in contributing to this field is to accept that much is uncertain, so that I may acknowledge that discoveries are to be made.

Uncertainty defines the world that surrounds me.
Uncertainty makes creativity possible, since change occurs only when accepted understandings and outlooks fade to make room for the new. While discussing works of literature with my peers, I choose not to blindly accept their beliefs and views as the only truths, but instead question their stances to better understand my own views and assumptions.

With uncertainty, the outcomes of life are boundless.

You might want to revise the essay structure to deal with the different meanings of "uncertain." At points, you seem to be using the word as it pertains to meanings, using it as a synonym for "ambiguous" or "open to multiple interpretations," as when you say "While discussing works of literature with my peers, I choose not to blindly accept their beliefs and views as the only truths, but instead question their stances to better understand my own views and assumptions." At other times, you seem to be going with uncertainty as it pertains to outcomes: "Pursuing a career in neuroscience requires this embracing of uncertainty since much of this thriving field has yet to be discovered, and so is uncertain." If you were to either make this distinction explicit, or choose to focus on only one of these meanings, you might get a stronger essay.

"Uncertainty" is a word that acts as a gargantuan, dark cloud whose only purpose is to obscure the sun, the bringer of light . For those who seek sureness, uncertainty arouses sensations of fear as it impairs vision, and hazes understanding. Unfortunately, this rejection of uncertainty hinders development of new or different opinions...

Great concept. Just simplify it by expressing one idea at a time. Also, check out Shunryu Suzuki's book Not Always So.