Phil 3:7-14, 2 Cor 11:2, Col 4:3, 2 Tim 4:5,17, Titus 1:3

In the Old Testament, the evangelist asked himself if any of the people knew what the best life was. (Ec 6:12)

Ec 6:12 For who knoweth what is good for man in this life, all the days of his vain life which he spendeth as a shadow? for who can tell a man what shall be after him under the sun?

Our best life is to believe that Jesus is the Christ and to know it deeply. (Phil 3:7-14, 2 Peter 3:18)

Phil 3:7 But what things were gain to me, those I counted loss for Christ. 8 Yea doubtless, and I count all things but loss for the excellency of the knowledge of Christ Jesus my Lord: for whom I have suffered the loss of all things, and do count them but dung, that I may win Christ, 9 And be found in him, not having mine own righteousness, which is of the law, but that which is through the faith of Christ, the righteousness which is of God by faith: 10 That I may know him, and the power of his resurrection, and the fellowship of his sufferings, being made conformable unto his death; 11 If by any means I might attain unto the resurrection of the dead. 12 Not as though I had already attained, either were already perfect: but I follow after, if that I may apprehend that for which also I am apprehended of Christ Jesus. 13 Brethren, I count not myself to have apprehended: but this one thing I do, forgetting those things which are behind, and reaching forth unto those things which are before, 14 I press toward the mark for the prize of the high calling of God in Christ Jesus.

2 Peter 3:18 But grow in grace, and in the knowledge of our Lord and Saviour Jesus Christ. To him be glory both now and for ever. Amen.

And our best life is to preach that Jesus is the Christ. (2 Corinthians 11:2, Col 4:3, 2 Tim 4:5,17, Titus 1:3)

2 Corinthians 11:2 For I am jealous over you with godly jealousy: for I have espoused you to one husband, that I may present you as a chaste virgin to Christ.

Col 4:3 Withal praying also for us, that God would open unto us a door of utterance, to speak the mystery of Christ, for which I am also in bonds:

2 Tim 4:5 But watch thou in all things, endure afflictions, do the work of an evangelist, make full proof of thy ministry. 17 Notwithstanding the Lord stood with me, and strengthened me; that by me the preaching might be fully known, and that all the Gentiles might hear: and I was delivered out of the mouth of the lion.

Titus 1:3 But hath in due times manifested his word through preaching, which is committed unto me according to the commandment of God our Saviour;