31 So be on your guard! Remember that for three years I never stopped warning each of you night and day with tears.

Read Acts 20:31 Using Other Translations

Therefore watch, and remember, that by the space of three years I ceased not to warn every one night and day with tears.
Therefore be alert, remembering that for three years I did not cease night or day to admonish everyone with tears.
Watch out! Remember the three years I was with you—my constant watch and care over you night and day, and my many tears for you.