NET

14 For the love of Christ controls us, since we have concluded this, that Christ died for all; therefore all have died.

Darby

14 For the love of the Christ constrains us, having judged this: that one died^D8430 for all, then all have died;

Darby Bible Notes

died - Or 'had died.' It is the aorist, and refers to the state Christ's death proved them to be in, in a state of nature. To make it a consequence of Christ's death is, I judge, an utter blunder.

KJV

14 For the love of Christ constraineth us; because we thus judge, that if one died for all, then were all dead:

Strong's

14 For ^G1063 the love^G26 of Christ^G5547 constraineth^G4912 us^G2248; because we thus^G5124 judge^G2919, that^G3754 if^G1487 one^G1520 died^G599 for^G5228 all^G3956, then^G686 were^G599 all^G3956 dead^G599: