Why do people have to give an account of their lives to God, when He already knows what they will do or have done, and why they did it?
"But according to thy hardness and impenitent heart, thou treasurest up to thyself wrath, against the day of wrath, and revelation of the just judgment of God. Who will render to every man according to his works. To them indeed, who according to patience in good work, seek glory and honour and incorruption, eternal life: But to them that are contentious, and who obey not the truth, but give credit to iniquity, wrath and indignation." Romans 2:5-8
"Therefore every one of us shall render account to God for himself." Romans 14:12
"For we must all be manifested before the judgement seat of Christ, that every one may receive the proper things of the body, according as he hath done, whether it be good or evil." 2 Corinthians 5:10
"Therefore it is no great thing if his ministers be transformed as the ministers of justice, whose end shall be according to their works." 2 Corinthians 11:15
"Knowing that you shall receive of the Lord the reward of inheritance. Serve ye the Lord Christ. For he that doth wrong, shall receive for that which he hath done wrongfully: and there is no respect of persons with God." Colossians 3:24-25
"And if you invoke as Father Him who, without respect of persons, judgeth according to every one's work: converse in fear during the time of your sojourning here." 1 Peter 1:17
"And I saw the dead, great and small, standing in the presence of the throne, and the books were opened; and another book was opened, which is the book of life; and the dead were judged by those things which were written in the books, according to their works. And the sea gave up the dead that were in it, and death and hell gave up their dead that were in them; and they were judged every one according to their works." Apocalypse 20:12-13