²³Truly I tell you, whoever says to this mountain, Be lifted up and thrown into the sea! and does not doubt at all in his heart but believes that what he says will take place, it will be done for him.

²⁴For this reason I am telling you, whatever you ask for in prayer, believe (trust and be confident) that it is granted to you, and you will [get it].

²⁵And whenever you stand praying, if you have anything against anyone, forgive him and let it drop (leave it, let it go), in order that your Father Who is in heaven may also forgive you your [own] failings and shortcomings and let them drop.

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(New Living Translation)

²² Then Jesus said to the disciples, “Have faith in God. ²³ I tell you the truth, you can say to this mountain, ‘May you be lifted up and thrown into the sea,’ and it will happen. But you must really believe it will happen and have no doubt in your heart. ²⁴ I tell you, you can pray for anything, and if you believe that you’ve received it, it will be yours. ²⁵ But when you are praying, first forgive anyone you are holding a grudge against, so that your Father in heaven will forgive your sins, too.

***

(Young's Literal Translation)

²³for verily I say to you, that whoever may say to this mount, Be taken up, and be cast into the sea, and may not doubt in his heart, but may believe that the things that he saith do come to pass, it shall be to him whatever he may say.

How do you get faith? Faith comes by hearing, and hearing by the Word of God. Spend time in the Word