Yes,There is no bar to adding verses to essay with a few needful exceptions.
1.Add verses relevantly where there is need to enhance your essay such as in islamic context solely.
2.It is generally suggested to avoid it owing to committing blunder of inaccuracy of verse.
3.Putting verses out of context may make you digress from essential context.

Keep things simple and your essay flawless.

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The fear of failure is worse than the failure"
Coelho