“By your knowledge,
This weak man
The brother for whom Christ died.”
ἀπόλλυται γὰρ ὁ ἀσθενῶν ἐν τῇ σῇ γνώσει, ὁ ἀδελφὸς δι’ ὃν Χριστὸς ἀπέθανεν.
Paul said that by your knowledge (ἐν τῇ σῇ γνώσει), this weak man (γὰρ ὁ ἀσθενῶν) was destroyed (ἀπόλλυται), the brother (ὁ ἀδελφὸς) for whom Christ died (δι’ ὃν Χριστὸς ἀπέθανεν). Paul pointed out that the wise and knowledgeable Christians in Corinth were destroying their fellow weak Christians by their example. They were hurting a Christian brother for whom Christ had died. Therefore, they should be more careful. Are you careful how you conduct your life as a Christian?