Taken from the St. Andrew’s Chapel website (R.C. Sproul’s church).

Sola Scriptura
Bible is the sole written divine revelation and alone can bind the conscience of believers absolutely.

Sola Fide
Justification is by faith alone. The merit of Christ imputed to us by faith is the sole ground of our acceptance by God, by which our sins are remitted.

Solus Christus
Christ is the only mediator through whose work we are redeemed.

Sola Gratia
Our salvation rests solely on the work of God’s grace for us and in us.

Soli Deo Gloria
To God alone belongs the glory.