Charles H. Spurgeon on Psalms 95:8

Harden not your heart. If ye will hear, learn to fear also. The sea and the land obey him, do not prove more obstinate than they!

"Yield to his love who round you now

The bands of a man would east."

We cannot soften our hearts, but we can harden them, and the consequences will be fatal. Today is too good a day to be profaned by the hardening of our hearts against our own mercies. While mercy reigns let not obduracy rebel. "As in the provocations, and as in the day of temptation in the wilderness" (or, "like Meribah, like the day of Massah in the wilderness"). Be not wilfully, wantonly, repeatedly, obstinately rebellious. Let the example of that unhappy generation serve as a beacon to you; do not repeat the offences which have already more than enough provoked the Lord. God remembers men's sins, and the more memorably so when they are committed by a favoured people, against frequent warnings, in defiance of terrible judgments, and in the midst of superlative mercies; such sins write their record in marble. Reader, this verse is for you, for you even if you can say, "He is our God, and we are the people of his pasture." Do not seek to turn aside the edge of the warning; thou hast good need of it, give good heed to it.