What does the Bible say about striving to enter the kingdom of heaven?

In Luke 13:22-24, Jesus instructs us to strive to enter through the narrow gate, emphasizing that many will seek to enter but will not be able. This striving refers to a fervent effort, akin to agonizing in battle, to obtain eternal life and salvation. God's grace works in our hearts, compelling us to press on despite obstacles. The desperate need for mercy pushes believers toward Christ as they seek to be part of His kingdom, reflecting the earnestness required in responding to His call.