c.i., did you try reading it out loud? If you're not familiar with pig Latin, you will be in a moment!
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Lelei, my friend writes:
"Noli te dicere numquam amatum esse."
However, if you intend it not as an instruction to a specific person, but rather as a general maxim, the subjunctive might be better:
"Ne te dicas numquam amatum esse."
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Hope that helps!