In Luke 17:6 the Lord answered, “If ye had faith as a grain of mustard seed, ye might say unto this sycamine tree, Be thou plucked up by the root, and be thou planted in the sea; and it should obey you.”
Faith is truly believing without reasoning in your mind, hence Jesus teaches us to have ‘childlike faith’ trusting God completely. Surrendering your life to Jesus Christ, giving your life to Jesus Christ also means trusting the Lord completely for everything. Luke 8:48 emphasises faith for healing; “Daughter, be of good comfort: thy faith hath made thee whole, go in peace.”
Hebrews 11: 5-6 “But without faith it is impossible to please him: for he that cometh to God must believe that He is and that He is a rewarder of them that diligently seek Him”.