What does it mean when the Bible says we need a pure heart?

In 1 Timothy 1:5, Paul states that the goal of the commandment is 'love from a pure heart.' This indicates that a pure heart is one that has been cleansed of sin and is receptive to the love of God. It is not about attaining moral perfection through human effort, but rather about the work of Christ cleansing us from our unrighteousness. Hebrews 9:14 affirms that the blood of Christ purges our conscience from dead works, leading to genuine love for God. Thus, a pure heart is essential for true, heartfelt worship and service to God, and it is achieved solely through the redemptive work of Christ.