The quote you give is attributed to Abraham, by Jesus, in His account of the rich man and Lazarus dying. The rich man finds himself in torments in hell, Lazarus finds himself in the Bosom of Abraham, in bliss.
When the rich man pleads with Abraham to send Lazarus to his living brothers on Earth, to warn them about hell, Abraham rejects it, with those words of wisdom. His brothers (like the rich man himself) already had the scriptures and the instructions on how to please God and be blessed by Him. If they ignored that, they would also ignore anybody claiming to have returned from the dead to advise them of the after-life.
Whatever anybody thinks to the comment of Abraham, we all have to admit that scepticism about listening to scriptural accounts of life after death has never been higher than now. Not only have we denials about Jesus rising from the dead, such unbelievers often go on to claim that Jesus never even lived. And some believers, such as Muslims, who claim Jesus did live, deny that He ever died (which means He could never have returned from the dead).
Why do all those people show such unbelief? Jesus showed that they will not be persuaded. They have the scriptures that tell them, but they reject the scriptures. Yet the scriptures have the power to overcome unbelief. The gospel itself is the power of God unto salvation (Romans 1:16). Since unbelief is at heart, this is a moral, rather than an intellectual, problem. To such unbelievers in the authority of God's word, the scriptures, no amount of evidence will ever turn their unbelief to faith. But the revealed Word of God has inherent power to do just that (compare John 6:63; Hebrews 4:12; James 1:18; 1Peter 1:23).
As Hebrews 4:12 shows, God's word examines us and finds us wanting - not the other way around. Only those with humility to seek God in sincerity find the scriptures changing their one-time hard hearts to hearts that beat for God. God does not judge us as needing to be of a certain intellectual caliber before we can understand and believe Him. Neither does God judge us as needing to attain a certain high moral standard before approving us for Heaven. Yes, He judges us on our moral standing and finds us ALL failing, thus ALL are deserving of hell. But there is nothing quite like the subject of hell to expose the true moral corruption in our hearts, for Jesus returned from the grave and has warned us of the hell to come for those who refuse to believe Him.
He said to religious zealots, "If you do not believe I am who I claim to be, you will die in your sin" - John 8:23. And we are appointed once to die, and after that to face judgment - the judgment seat of Christ. AiH