A few more ideas to consider:
"But there are many important questions on which Scripture is silent. Sola Scriptura makes no claim to the contrary. Nor does sola Scriptura claim that everything Jesus or the apostles ever taught is preserved in Scripture. It only means that everything necessary, everything binding on our consciences, and everything God requires of us is given to us in Scripture (2 Peter 1:3). Furthermore, we are forbidden to add to or take away from Scripture (cf. Deut. 4:2; 12:32; Rev. 22:18-19). To add to it is to lay on people a burden that God Himself does not intend for them to bear (cf. Matt. 23:4)." John MacArthur
"The force and clarity of the Apostle’s teaching here are striking. In spite of the rich oral teaching Timothy had, he is to preach the Scriptures because those Scriptures give him clearly all that he needs for wisdom and preparation to instruct the people of God in faith and all good works. The Scripture makes him wise for salvation, and equips him with everything he needs for doing every good work required of the preacher of God. The sufficiency and clarity of the Word are taught in this one section of Scripture over and over again. John Chrysostom paraphrased the meaning of Paul’s words to Timothy this way: “You have Scripture for a master instead of me; from there you can learn whatever you would know.” - Robert Godfrey
“I do not want to throw out all those more learned [than I], but Scripture alone to reign, and not to interpret it by my own spirit or the spirit of any man, but I want to understand it by itself and its spirit.” (Luther, Assertio omnium articulorum M. Lutheri per bullam Leonis X. novissimam damnatorum)
"But there are many important questions on which Scripture is silent. Sola Scriptura makes no claim to the contrary. Nor does sola Scriptura claim that everything Jesus or the apostles ever taught is preserved in Scripture. It only means that everything necessary, everything binding on our consciences, and everything God requires of us is given to us in Scripture (2 Peter 1:3). Furthermore, we are forbidden to add to or take away from Scripture (cf. Deut. 4:2; 12:32; Rev. 22:18-19). To add to it is to lay on people a burden that God Himself does not intend for them to bear (cf. Matt. 23:4)." John MacArthur
"The force and clarity of the Apostle’s teaching here are striking. In spite of the rich oral teaching Timothy had, he is to preach the Scriptures because those Scriptures give him clearly all that he needs for wisdom and preparation to instruct the people of God in faith and all good works. The Scripture makes him wise for salvation, and equips him with everything he needs for doing every good work required of the preacher of God. The sufficiency and clarity of the Word are taught in this one section of Scripture over and over again. John Chrysostom paraphrased the meaning of Paul’s words to Timothy this way: “You have Scripture for a master instead of me; from there you can learn whatever you would know.” - Robert Godfrey
“I do not want to throw out all those more learned [than I], but Scripture alone to reign, and not to interpret it by my own spirit or the spirit of any man, but I want to understand it by itself and its spirit.” (Luther, Assertio omnium articulorum M. Lutheri per bullam Leonis X. novissimam damnatorum)