Mark 9:23 Jesus said to him, “If you can believe, all things [are] possible to him who believes.”

God Almighty and His Divine Word is not subject to the natural laws of this world. God Almighty Created this world with His spoken Word and His Word is Spirit and is Life, full of Creative Power backed by Heaven. The Word of God can never fail it is Eternal and it will never return void.
When The Lord Jesus Christ said Only Believe He was telling us to not look or be distracted by anything around you and look only at Him and don’t doubt Only Believe. Believe means you have accepted one hundred percent what The Word of God promises you!

You are not moved or distracted by symptoms or any thing you see or hear! Believe is you are one hundred percent convinced that Jesus will do what His Word Promises you. The moment you are distracted by sight, sounds or thoughts means you are not convinced or believing Jesus then you start to doubt.

It is easy to Believe Jesus and His Word when you are faced with the impossible and there is no hope to trust in. When your heart and spirit are fixed on Jesus and His Word you are looking into The Spirit where God Almighty and Jesus are. Our help comes from Jesus if you would do not doubt and only Believe! The devil uses doubt in your mind to steal God’s promises from you!

John 6:63-64 It is the Spirit who gives life; the flesh profits nothing. The words that I speak to you are spirit, and they are life.

John 4:24 God is Spirit, and those who worship Him must worship in spirit and truth.”

Romans 4:20-22 He did not waver at the promise of God through unbelief, but was strengthened in faith, giving glory to God, and being fully convinced that what He had promised He was also able to perform. And therefore “it was accounted to him for righteousness.”

Hebrews 12:2 looking unto Jesus, the author and finisher of our faith, who for the joy that was set before Him endured the cross, despising the shame, and has sat down at the right hand of the throne of God.

Colossians 3:1-3 If then you were raised with Christ, seek those things which are above, where Christ is, sitting at the right hand of God. Set your mind on things above, not on things on the earth.

Matthew 14:29-32 So He said, “Come.” And when Peter had come down out of the boat, he walked on the water to go to Jesus. But when he saw that the wind was boisterous, he was afraid; and beginning to sink he cried out, saying, “Lord, save me!” And immediately Jesus stretched out His hand and caught him, and said to him, “O you of little faith, why did you doubt?” And when they got into the boat, the wind ceased.

2 Corinthians 4:17-18 while we do not look at the things which are seen, but at the things which are not seen. For the things which are seen are temporary, but the things which are not seen are eternal.