John MacArthur on Proclamation

The issue is not the skill of the one proclaiming the message, the packaging of the message, or the technique used in proclaiming it. The issue is the condition of the hearer. Jesus illustrated that principle in the parable of the sower. The same message (the seed) is proclaimed by the same individual (the sower); the only variable is the condition of the four soils. What is essential for the messengers of the gospel is not cleverness but clarity. Only God can open the sin-blinded eyes of those who are “dead in [their] trespasses and sins” (Eph. 2:1; cf. v. 5; Matt. 8:22; Eph. 4:18).
John MacArthur

2 Corinthians, p. 131.