And because iniquity shall abound, the love of many shall wax cold.   But he that shall endure unto the end, the same shall be saved.  Matthew 24:12‭-‬13

Endurance - noun - To continue, despite fatigue, stress, or other adverse conditions.

Work out your salvation with fear and trembling. Philippians 2:12

But I keep under my body, and bring it into subjection: lest that by any means, when I have preached to others, I myself should be a castaway.  I Corinthians 9:27