We feel both unhappiness and happiness but we need to practice being happy.
Sometimes, we face hardships and trials and will be divided into two groups.
One is those who know the blessings of the difficulties and the other is those who give up and complain about these situations.
Then, what kind of people should we be? God wants us to belong to the former.
Even if the way to believe in God is hard, let's just think about one thing.
When we endure, we can finally enter the kingdom of heaven.

[1 Thessalonians 5:16–18]
Be joyful always; pray continually; give thanks in all circumstances,
for this is God’s will for you in Christ Jesus.

[James 1:12–15]
Blessed is the man who perseveres under trial, because when he has stood the test, he will receive the crown of life that God has promised to those who love him. . . . but each one is tempted when, by his own evil desire, he is dragged away and enticed. Then, after desire has conceived, it gives birth to sin; and sin, when it is full-grown, gives birth to death.