What are the remaining verses of Al-Shafi'i that begin with, "We blame our time, though the fault lies within us"?

The remaining poetic verses are: "We blame our time, yet the fault is in us; and our time has no fault other than us. We criticize this time without a sin, and were time to speak, it would criticize us. A wolf does not eat the flesh of a wolf, yet some of us openly devour others." There is another narration for these verses. Some literary figures attribute these verses to Al-Shafi'i, while others attribute them to Muhammad ibn Muhammad ibn Ja'far ibn Lan Kaka.