Keep a Pleasant Countenance and Melodious Voice
Parents, be cheerful, not common and cheap, but be thankful and obedient and submissive to your heavenly Father. You are not at liberty to act out your feelings if things should arise that irritate.
Winning love is to be like deep waters, ever flowing forth in the management of your children. They are the lambs of the flock of God. Bring your little ones to Christ. If parents would educate their children to be pleasant, they should never speak in a scolding manner to them. Educate yourself to carry a pleasant countenance, and bring all the sweetness and melody possible into your voice.
The angels of God are ever near your little ones, and your harsh loud tones of fretfulness are not pleasant to their ears. The mother should cultivate a cheerful, contented, happy disposition. Every effort in this direction will be abundantly repaid in both the physical well-being and the moral character of her children. A cheerful spirit will promote the happiness of her family and in a very great degree improve her own health.
Adventist Home, Chapter 70, Pg 432-433
Proverbs 15:13 KJV
13 A merry heart maketh a cheerful countenance: but by sorrow of the heart the spirit is broken.
Proverbs 17:22 KJV
22 A merry heart doeth good like a medicine: but a broken spirit drieth the bones.