"Why, every one knows that in practice we very often find tenses
interchanged when time is spoken of; and especially this is the custom in
Holy Scripture, not only in respect of the past tense, and of the present;
but even of the future ... It would be a long task to reckon up all the
expressions of this kind which students have noticed."
St Gregory of Nazianzus, 4th century
Oration XXIX. The Third Theological Oration. On the Son. (CE 379-381)