Psalm 95:7-9
Today, if you hear his voice, do not harden your hearts, as at Meribah, as on the day at Massah in the wilderness, when your fathers put me to the test and put me to the proof, though they had seen my work.

The gospel is not good advice, but good news. It does not speak of what man is to do, but tells what Christ has done.
A.W. Pink