who has been tempted in every way, just as we are-- yet was without sin.
Heb 2:18

Practicing self-control (temperance) means we say no to things that might harm our bodies or our minds.
It's not always easy to say, 'That's enough'. That's why we need God's spirit of self-control. Some habits are hard to break. The best way to deal with bad habits is not to start them in the first place. Sometimes people lead us into bad things they think are fun. They don't know that doing such things can lead to a lot of trouble.
God tells us that a Christian's body is the temple of His Spirit.

I Cor. 6:15
We need to treat our bodies with respect. If someone wants us to smoke, or drink, or do something else to harm our bodies we need to tell them 'NO!' just like Jesus told Satan when he wanted Him to do something that was wrong. Solomon tells us the same thing.

Prov. 1:10  My son, if sinners entice you, do not give in to them.

A good athlete practices self-control so that he can play a good game. God wants us to practice self-control so that we can inherit His Kingdom.

I Co. 9:25 Everyone who competes in the games goes into strict training. They do it to get a crown that will not last; but we do it to get a crown that will last forever.

Having self-control doesn't mean we do without good things.  Jesus enjoyed the good things God gave Him and some people, who didn't understand, called Him bad names.

Mt. 11:19

But Jesus knew it was all right to enjoy certain things in moderation. He didn't let what other people said about Him upset Him. It's not always easy to practice self-control in dealing with others. Sometimes people say or do things that are mean. How do we deal with these people? God wants us to have a tough skin but a soft heart.
He wants us to forgive those who hurt our feelings. He wants us to try and help heal the hurts of others.
God wants us to turn the other cheek and be peacemakers.

Matthew 5:38-48

God wants us to be friends with as many people as we can.

Rom. 12:18

Everyone makes mistakes, and everyone says things they shouldn't.

Jas 3:8

God wants us to learn to control our speech.

I Pe 3:10  "Whoever would love life and see good days must keep his tongue from evil and his lips from deceitful speech.

He wants us to control our tempers too.