People who ignore the message (revelations) of God will be deprived of the peace of mind (real happiness) in this world!

Verses 123-124 of Chapter 20

He (Allah) said: Get forth you two therefrom, all (of you), one of you (is) enemy to another. So there will surely come to you guidance from Me, then whoever follows My guidance, he shall not go astray nor be unhappy; And whoever turns away from My reminder, his shall be a straitened life, and We will raise him on the day of resurrection, blind.