‭Jude 1:5 But I want to remind you, though you once knew this, that the Lord, having saved the people out of the land of Egypt, afterward destroyed those who did not believe. 

They say “seeing is believing”, and it makes sense to believe in what you see. But today's verse states that even the Israelites God saved from a life of slavery, some still didn't have faith in God, and He destroyed them. You've got to wonder what happened that a certain group failed to see the goodness and blessings of God. 

‭Matthew 13:15. For the hearts of this people have grown dull. Their  ears are hard of hearing, And their eyes they have closed, Lest they should see with  their  eyes and hear with  their  ears, Lest they should understand with  their  hearts and turn, So that I should  heal them.’

It's sad to think that everything a person sees, they still don't get it. When the heart gets hard, you become deaf and blind to God’s simple message for His creation, you and me, He loves you and covered your sin debt with the shed blood of Jesus Christ. Although you were not witness to His crucification, God's word documents this historic event and captures His ministry and dealings with everyday people. 

Maybe your environment has hindered you from hearing the truth of God and His free offer of salvation (forgiveness of sins). Seek out His word and absorb its truths. God will soften your heart and so your eyes will see the blessings only He can give you when you experience His presence in your life.