“Aequam mementō rēbus in arduīs servāre mentem” opens Horace’s Odes 2.3, a poem addressed to Dellius. It advises keeping a level mind in hard times, and no less in good ones, kept clear of insolent joy.
Mementō is a future imperative, “remember”, and servāre mentem is what it governs: to keep the mind, aequam, even. The sentence runs on to name the other danger, joy that is too proud, and ends by addressing Dellius as one who must die. Tap the words to see how it is built.
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Horace · Odes 2.3
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Aequambalancedmentemyour mind