The salt of the earth = a very good and honest person.

• You will be fine working for someone like him.  He’s the salt of the earth.
• Don’t worry ,even with all his success Robin is still the salt of the earth.  He donates most of salary to charity and volunteers weekly at the hospital.
• Frank’s mother is the salt of the earth.  She has five children of her own and yet fosters three others.

Go to the ends of the earth = do anything possible.

• She’d go to the ends of the earth to save her child.
• After failing the CLAT exam twice already, he would go to the ends of the earth to pass  it.
• We would go to the ends of the earth to please her.

To fall on stony ground= be ignored or badly received.

• Unfortunately, my advice fell on stony ground.
• Her speech about the need for a peaceful solution to the crisis fell on stony ground.
• Alan’s charming smile fell on stony ground with her.
• Some initiatives have already fallen on stony ground.