'Well balanced' in the Bible

For God did not give us a spirit of timidity or cowardice or fear, but [He has given us a spirit] of power and of love and of sound judgment and personal discipline [abilities that result in a calm, well-balanced mind and self-control].

Be sober [well balanced and self-disciplined], be alert and cautious at all times. That enemy of yours, the devil, prowls around like a roaring lion [fiercely hungry], seeking someone to devour.