Psychology and temperamental make-up; introvert or extrovert; ‘know thyself’; the importance of physical condition; the devil and spiritual depression.
Spiritual Depression: General Consideration – Dr. Martyn Lloyd-Jones Sermon
Psalm 42:5 Why, my soul, are you downcast?
Why so disturbed within me?
Put your hope in God,
for I will yet praise him,
my Savior and my God.