The Lord is your keeper;
The Lord is your shade on your right hand.
6 The sun will not smite you by day,
Nor the moon by night.
Lord, you are my keeper, my protector. You are my shade. You protect me from all that is harmful. You have given yourself to me. You put yourself in the way of evil and harm for me, so that I may be free of all evil. Lord, I rest in your shadow, in your shelter. You are my refuge and fortress. I trust in you. You will save me from all that is evil and harmful, from all that tries to ensnare me. I feel safe and confident in your care. I will not be afraid. I look out and see the evil schemes of the wicked and I observe their punishment. But I trust in you and I am safe. No harm will come to me. You will guard me in all my ways. (adapted from Psalm 91)
Exposition of Psalm 121:6 from The Treasury of David
Verse 6. The sun shall not smite thee by day, nor the moon by night. None but the Lord could shelter us from these tremendous forces. These two great lights rule the day and the night, and under the lordship of both we shall labour or rest in equal safety. Doubtless there are dangers of the light and of the dark, but in both and from both we shall be preserved — literally from excessive heat and from baneful chills; mystically from any injurious effects which might follow from doctrine bright or dim; spiritually from the evils of prosperity and adversity; eternally from the strain of overpowering glory and from the pressure of terrible events, such as judgment and the burning of the world. Day and night make up all time: thus the ever present protection never ceases. All evil may be ranked as under the sun or the moon, and if neither of these can smite us we are indeed secure. God has not made a new sun or a fresh moon for his chosen, they exist under the same outward circumstances as others, but the power to smite is in their case removed from temporal agencies; saints are enriched, and not injured, by the powers which govern the earth’s condition; to them has the Lord given “the precious things brought forth by the sun, and the precious things put forth by the moon,” while at the same moment he has removed from them all glare and curse of heat or damp, of glare or chill.
Information on the Effects of the Sun
God in His kindness has protected us from most of the potential harm of the sun’s rays. He has given us a protective atmosphere. According to sciencelearn.org.nz,
The Earth’s atmosphere blocks 98.7 percent of the Sun’s UV radiation from penetrating through the atmosphere. The 2.3 percent that gets through has both positive and negative effects.
Here, according to this article, are two positive effects and two negative effects:
Positive (beneficial) effects of UV
Triggers vitamin D – UV from the Sun is needed by our bodies to produce vitamin D. Vitamin D helps strengthen bones, muscles and the body’s immune system. It may also lower the risk of getting some kinds of cancers such as coloncancer.
Helps some skin conditions – UV is used in the treatment of skin conditions such as psoriasis. This is a condition where the skin sheds its cells too quickly and develops itchy, scaly patches. Exposure to UV slows the growth of the skin cells and relieves the symptoms.
Negative (harmful) effects of UV
Causes skin cancer – UV is an environmental human carcinogen. It’s the most prominent and universal cancer-causing agent in our environment. There is very strong evidence that each of the three main types of skin cancer (basal cell carcinoma, squamous cell carcinoma and melanoma) is caused by sun exposure. Research shows that as many as 90 percent of skin cancers are due to UV radiation.
Causes sunburn – UV burns the skin. Sunburn is a burn that occurs when skin cells are damaged. This damage to the skin is caused by the absorption of energy from UV rays. Extra blood flows to the damaged skin in an attempt to repair it, which is why your skin turns red when you are sunburnt.