-you instructed
The word instruisteis is the preterite form of instruir in the second person plural.
See the full instruir conjugation


Las palabras son consecuencia de ellos y si el cambio es sincero, estas saldrán suaves, profundas, verdaderas y moverán montañas, como bien sabéis porque ya os instruisteis.
The words elapses from them and the sincere change is soft, deep, true and transport mountains, as we have already instructed you.
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