This is one of the most popular Bible passages. Psalm 23.
I remember learning to speak this Psalm as a child. My mom made sure that we learnt it in our formative years, and need I say that it laced an awesome foundation for us as children.
Knowing that the Lord is your shepherd, whether it be morning, noon, or night, is the greatest assurance there is.
Rest in this knowledge and walk in this understanding. It will bring you peace.
Shalom.