What does it mean to 'enter into rest' according to the Bible?

Entering into rest, as mentioned in Hebrews 4, signifies a spiritual state achieved through faith in Jesus Christ. It's the recognition that all our efforts, akin to the work of the Old Testament Israelites in trying to earn favor through the Law, are insufficient. Instead, rest is found in acknowledging that Christ has completed the work of salvation on our behalf. This understanding liberates believers from the burdens of legalism while enabling them to experience the peace and joy that come from a relationship with Him, where they no longer strive for acceptance but receive it freely.