Caravaggio, Saint Jerome Writing (c. 1605), Galleria Borghese. Public domain.
3 verses in the King James Version. Word study for “sound” →
For God hath not given us the spirit of fear; but of power, and of love, and of a sound mind.
Hold fast the form of sound words, which thou hast heard of me, in faith and love which is in Christ Jesus.
For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears;