Self-control is the ability to keep cool while someone is making it hot for you.
For a bishop must be blameless, as a steward of God, not self-willed, not quick-tempered, not given to wine, not violent, not greedy for money, but hospitable, a lover of what is good, sober-minded, just, holy, self-controlled, holding fast the faithful word as he has been taught, that he may be able, by sound doctrine, both to exhort and convict those who contradict. Titus 1:7-9
King James says temperate but self-controlled is now preferred since temperance usually deals with only one meaning.
The word demands you be master over your indulgences and appetites; curbing and restraining yourself.
You should exercise self-control over those things you are apt to lose control over – your language, your anger, your reaction, and your negativity.
The one place many lose control is over their mouth. James had much to say about the power of the tongue and the danger it poses.
As someone once said, “Rule lust, temper the tongue, and bridle the belly.”