If I had not come and spoken to them, they would not be guilty of sin. But now they have no excuse for their sin.
In context
20Remember the word I spoke to you: ‘A servant is not greater than his master.’ If they persecuted me, they will persecute you too. If they kept my word, they will keep yours as well. 21They will do all this to you because of my name, for they do not know the one who sent me. 22If I had not come and spoken to them, they would not be guilty of sin. But now they have no excuse for their sin. 23Whoever hates me hates my Father too. 24If I had not done among them the works no one else has done, they would not be guilty of sin. But now they have seen, and they have hated both me and my Father.