“Because I have said
Sorrow has filled
ἀλλ’ ὅτι ταῦτα λελάληκα ὑμῖν, ἡ λύπη πεπλήρωκεν ὑμῶν τὴν καρδίαν
John uniquely indicated that Jesus said that because he had said these things to them (ἀλλ’ ὅτι ταῦτα λελάληκα ὑμῖν), sorrow (ἡ λύπη) had filled (πεπλήρωκεν) their hearts (ὑμῶν τὴν καρδίαν). Now that Jesus had told about the future problems and persecutions, the apostles and disciples were sorrowful and sad. Are you worried about the future?