But without faith it is impossible to please Him, for he who comes to God must believe that He is, and that He is a rewarder of those who diligently seek Him.
why believe
Mark 5:36 NKJV
As soon as Jesus heard the word that was spoken, He said to the ruler of the synagogue, “Do not be afraid; only believe.”
Joshua 1:9 NKJV
Have I not commanded you? Be strong and of good courage; do not be afraid, nor be dismayed, for the Lord your God is with you wherever you go.