Jonathan Edwards
The design of gospel tracts is to awaken the minds of men, and to excite in them a sense of their danger and their need of a Savior.

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.
Psalm 95:7-9