Sola scriptura is the doctrine that the Bible

Bible

The Bible refers to any one of the collections of the primary religious texts of Judaism and Christianity. There is no common version of the Bible, as the individual books , their contents and their order vary among denominations...

 contains all knowledge necessary for salvation

Salvation

Within religion salvation is the phenomenon of being saved from the undesirable condition of bondage or suffering experienced by the psyche or soul that has arisen as a result of unskillful or immoral actions generically referred to as sins. Salvation may also be called "deliverance" or...

 and holiness

Sanctification

Sanctity is an ancient concept widespread among religions, a property of a thing or person sacred or set apart within the religion, from totem poles through temple vessels to days of the week, to a human believer who achieves this state. Sanctification is the act or process of acquiring sanctity,...

. Consequently, sola scriptura demands that only those doctrines are to be admitted or confessed that are found directly within or indirectly by using valid

Validity

In logic, argument is valid if and only if its conclusion is entailed by its premises, a formula is valid if and only if it is true under every interpretation, and an argument form is valid if and only if every argument of that logical form is valid....

 logical deduction or valid deductive reasoning

Deductive reasoning

Deductive reasoning, also called deductive logic, is reasoning which constructs or evaluates deductive arguments. Deductive arguments are attempts to show that a conclusion necessarily follows from a set of premises or hypothesis...

 from scripture. However, sola scriptura is not a denial of other authorities governing Christian life and devotion.