Then you will walk safely in your way, and your foot will not stumble. When you lie down, you will not be afraid; yes, you will lie down and your sleep will be sweet. Do not be afraid of sudden terror, nor of trouble from the wicked when it comes; For the Lord will be your confidence, and will keep your foot from being caught. Proverbs 3:23-26
"Then", refers to the keeping of sound wisdom and discretion (Proverbs 2:21). Proverbs 3:23-26 describe the results of wisdom.
Walk safely: quietness and security
Not stumble: make a fatal mistake; of serious (even fatal) injury
Afraid: be in dread
Not afraid: FEAR NOT!
Sudden terror: sudden terror of dread
Trouble: devastation, ruin
Lord: deity Yahweh, the proper name of the God
Keep: preserve, protect
Foot: be able to endure, journey
Walk safely. Sweet sleep. No fear. Confidence. Protection. And it's all the result of finding Wisdom and obeying Wisdom—not just knowing about it, but putting it into practice. And remember the source of true Wisdom is God Himself!
Walk safely. Sweet sleep. No fear. Confidence. Protection. Each is available to me, and it begins when my heart is permeated with a deep sense of reverence for God (Acts 9:31 MSG).