Lead me not into temptation

What does it mean to pray "Lead me not into temptation" as Jesus asked? I love this insight that Mary Baker Eddy wrote to a young student. She's always guiding us to align our thoughts with the real, the Divine, and heal.

"Lead me not into temptation," — scientifically rendered, —Lead me not to lose sight of strict purity, clean pure thoughts; let all my thoughts and aims be high, unselfish, charitable, meek, — spiritually minded. With this altitude of thought your mind is losing materiality and gaining spirituality and this is the state of mind that heals the sick." -Mary Baker Eddy to James Neal on January 28, 1897.