We read in Psalm 121: 5-8 Reina-Valera 1960 (NIV)
5 Jehovah is your guardian;
Jehovah is your shadow at your right hand.
6 The sun will not tire you by day,
Not the moon at night.
7 Jehovah will keep you from all evil;
He will keep your soul.
8 Jehovah will keep your way out and your entrance
From now and forever.
Source
As Christians we must walk by faith and believe all the promises established in the word of God, we must also make a difference in the world without despair in the face of adversities and different situations we face daily because we must trust that God goes with us and Save wherever we go.
The psalmist expresses it in this psalm tells us that Jehovah is our guardian and that he takes care of us 24 hours a day, which implies day and night since he clarifies in his word that the sun and the moon will not tire us.
God is immensely amazing and wonderful. He keeps his promises just looking for hearts that believe him.