The gift of Christ Jesus to humanity came with a promise of happiness.

"You will have joy and gladness, and many will rejoice at his birth. - Like 1: 14.

Thus, getting to know Christ Jesus is the first step to attaining a state of happiness. Having Christ formed in our heart is what will help us to accept reprimand like the Corinthians did. When we are disciplined, it breeds sorrows, but when we allow the words of caution to workout repentance in us, surely, happiness come.

2Co 7:9 But now I am happy—not because I made you sad, but because your sadness made you change your ways. That sadness was used by God, and so we caused you no harm.
2Co 7:10 For the sadness that is used by God brings a change of heart that leads to salvation—and there is no regret in that! But sadness that is merely human causes death.