NET
10 Do not say, “Why were the old days better than these days?” for it is not wise to ask that.
Darby
10 Say not, How is it that the former days were better than these? for thou dost not inquire wisely concerning this.
KJV
10 Say not thou, What is [the cause] that the former days were better than these? for thou dost not enquire wisely concerning this.