Yes this is another one of those, "I'm too busy to write a real post so I'm gonna give you a quote" posts. Even so, I think this quote may bring more conviction and edification to your soul than anything I could squeeze out of my moldy attic of a brain and weak atrophied heart.
The following comes from the book The Seven Sayings of the Saviour on the Cross by A.W. Pink (p. 25-26).
"They know not what they do" (Luke 23:34). This does not mean that the enemies of Christ were ignorant of the fact of His crucifixtion. THey did know full well that they had cried out "Crucify him!" They did know full well that their vile request had been granted them by Pilate. They did know full well that He had been nailed to the Tree, for they were eyewitnesses of the crime. What, then, did our Lord mean when He said, "They know not what they do"? He meant they were ignorant of the enormity of their crime. They "knew not" that it was the Lord of Glory they were crucifying. The emphasis is not on "they know not" but on "they know not what they do."
And yet they ought to have known. Their blindness was inexcusable. The Old Testament prophecies that had recieved their fulfillment in Him were sufficiently plain to identify Him as the Holy One of God. His teaching was unique, for His very critics were forced to admit, "Never man spake like this man" (John 7:46). And what of His perfect life! He had lived before men a life that had never been lived on earth before. He pleased not Himself. He went about doing good. He was ever at the disposal of others. THere was no self-seeking about Him. His was a life of self-sacrifice from beginning to end. His was a life ever lived to the glory of God. His was a life on which was stamped Heaven's approval, for the Father's voice testified audibly, "This is my beloved Son, in whom I am well pleased." No, there was no excuse for their ignorance. It only demonstrated the blindness of their hearts. Their rejection of the Son of God bore full witness, once for all, that hte carnal mind is "enmity against God"
How sad to think this terrible tradgedy is still being repeated! Sinner, you little know what you are doing in neglecting God's great salvation. You little know how awful is the sin of slighting the Christ of God and spurning the invitations of His mercy. You little know the deep guilt that is attached to your act of refusing to recieve the only One who can save you from your sins. You little know how fearful is the crime of saying, "We will not have this man to reign over us." You know not what you do. You regard the vital issue with callous indifference. The question comes today as it did of old, "What shall I do with Jesus which is called Christ?" for you have to do something with Him: either you despise and reject Him, or you recieve Him as the Saviour of your soul and the Lord of your life. But, I say again, it seems to you a matter of small moment, of little importance, which you do. For years you have resisted the strivings of His Spirit. For years you have shelved the all-important consideration. For years you have steeled your heart against Him, closed your ears to His appeals, and shut your eyes to His surpassing beauty. AH! You know not WHAT you do. You are blind to your madness. Blind to your terrible sin. Yet you are not excuseless. You may be saved now if you will. "Believe on the Lord Jesus Christ, and thou shalt be saved." O come to the Saviour now and say with one of old, "Lord, that I might recieve my sight."
"The said Jesus, Father, forgive them; for they know not what they do."