Strong’s Greek
G4995 — sophronismos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
σωφρονισμός
sophronismos — pronounced so-fron-is-mos'
from 4994; discipline, i.e. self-control:--sound mind. see GREEK for 4994
1 occurrence in the KJV.
2 Timothy 1:7
For God hath not given us the spirit of fear; but of power, and of love, and of a sound mind.