Let no evil make its way into your heart. Our heart is where the Lord resides and our hearts will not be divided. Let your mind be uplifted to Christ Jesus. He will guide us. He will protect us.
Psalm 23
A Psalm of David. The Lord is my shepherd, I shall not want. He makes me lie down in green pastures; he leads me beside still waters;* he restores my soul.* He leads me in right paths* for his name’s sake.
Even though I walk through the darkest valley,* I fear no evil; for you are with me; your rod and your staff— they comfort me.
You prepare a table before me in the presence of my enemies; you anoint my head with oil; my cup overflows. Surely* goodness and mercy* shall follow me all the days of my life, and I shall dwell in the house of the Lord my whole life long.*
Good book by a Russian on how to pray without ceasing.
https://en.m.wikipedia.org/wiki/The_Way_of_a_Pilgrim