Charles Spurgeon Commentary Isaiah 58:1

"Cry aloud, spare not, lift up thy voice like a trumpet, and declare unto my people their transgression, and to the house of Jacob their sins." — Isaiah 58:1 (ASV)

Cry aloud, spare not, lift up thy voice like a trumpet and shew my people their transgression, and the house of Jacob their sins.

See, friends, how stolid people are by nature. God's messengers must not only speak; they must speak very forcibly, they must speak as with the sound of a trumpet, before people will hear them. Among the most stolid of all are those who think themselves God's people but who are not really and spiritually so. It is hard to reach the common sinner; but it is harder still to reach the baptized sinner, the one who professes to be a Christian but who has only the name to live while he is spiritually dead.