Rom 1:16, 1 Cor 1:24, Mt 6:33, Heb 12:2
In the Old Testament, David told the Israelites to boast in God and seek God (1 Chronicles 16:10-11).
1 Chronicles 16:10 Glory ye in his holy name: let the heart of them rejoice that seek the Lord. 11 Seek the Lord and his strength, seek his face continually.
Christ is the power of God to bring salvation to those who believe in Jesus as the Christ. (Romans 1:16, 1 Corinthians 1:24)
Romans 1:16 For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.
1 Corinthians 1:24 But unto them which are called, both Jews and Greeks, Christ the power of God, and the wisdom of God.
We must first seek God's righteousness, Christ, and strive for evangelism, the kingdom of God. (Mt 6:33, Heb 12:2)
Mt 6:33 But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you.
Heb 12:2 Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God.