Then ... call ... answer - when sin is renounced (Isa 65:24). When the Lord’s call is not hearkened to, He will not hear our “call” (Psa 66:18; Pro 1:24, Pro 1:28; Pro 15:29; Pro 28:9).
putting forth of ... finger - the finger of scorn pointed at simple-minded godly men. The middle finger was so used by the Romans.