Absolutely it is.
2 Timothy 3:16-17 All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness, that the man of God may be complete, equipped for every good work.
However, these things aren't. I never saw any of these phrases or words in Scripture.
trinity
catholic
pope
eucharist
sacraments
annulment
assumption
immaculate conception
mass
purgatory
magisterium
infallible
confirmation
crucifix
rosary
mortal sin
venial sin
perpetual virginity
apostolic succession
indulgences
hyperdulia
catechism
real presence
transubstantiation
liturgy
free will
holy water
monstrance
sacred tradition
apostolic succession
Benefactress
Mediatrix
Queen of Heaven
Mother of God
beatific vision
invincible ignorance
Divine Office
guardian angel
Corporal Works of Mercy
Petrine authority
infallible
heresy
+1
Not sure why some Catholics seemingly go out of their way to minimize the very book they claim to have given us.
You don’t know the difference between ALL and ONLY?
Get back to me when you have discovered the meaning of ALL and the meaning of ONLY.
BTW: I’ve never found any mention of “Reformation Sunday” in Scripture.