A.T. Robertson Commentary 1 Corinthians 7:30

"and those that weep, as though they wept not; and those that rejoice, as though they rejoiced not; and those that buy, as though they possessed not;" — 1 Corinthians 7:30 (ASV)

As though they possessed not (ως μη κατεχοντες). See this use of κατεχω, old verb to hold down (Luke 14:9), to keep fast, to possess, in 2 Corinthians 6:10. Paul means that all earthly relations are to hang loosely about us in view of the second coming.