We know it is God’s will to heal us because of God’s redemptive names. God is the same yesterday – today – and forever. His name has not changed.

FF BOSWORTH
CHRIST THE HEALER
THE VALUE OF GOD’S REDEMPTIVE NAMES

Since He heals us by sending His Word, what can be more His Word than His redemptive and covenant names, which were given, all seven of them, for the specific purpose of revealing to every man in Adam’s race His redemptive attitude toward them? When Christ commands us to “preach the Gospel to every creature,” He means that we shall tell the “Good News” of redemption. His seven redemptive names reveal what our redemption includes. He has many other names, but only seven redemptive names. These seven names are never used in the Scriptures except in His dealings with man. Not six names, not eight, but seven, the perfect number, because He is a perfect Savior. His redemption covers the whole scope of human need. The blessings revealed by each of these names are all in the Atonement. For instance, JEHOVAH- SHAMMAH means “the LORD is present,” “made nigh by the blood of Christ.” JEHOVAH-SHALOM is translated “the LORD is our Peace.” This is in the Atonement because “the chastisement of our peace was upon him.”

JEHOVAH-RA-AH is translated “the LORD is my Shepherd.” He became our Shepherd by giving His life for the sheep. This privilege is in the Atonement.
JEHOVAH-JIREH means “the LORD will provide” an offering. Christ Himself was the offering provided on Calvary.

He became JEHOVAH-NISSI, “The LORD our Banner” or Victor, by spoiling principalities and powers on the Cross.
He bore our sins, and became JEHOVAH-TSIDKENU, “the LORD our Righteousness.” He opened the way for every sinner to receive the gift of righteousness. JEHOVAH-RAPHA is translated “I am the LORD that healeth thee,” or, “I am the LORD thy Physician.” This also is in the Atonement, for He “himself took our infirmities and bare our sicknesses.”
This completes the list of seven names, which were given for the purpose of revealing God’s relationship toward all of us under each of these seven titles. These seven names all belong abidingly to Christ. It is under each of these seven titles that He “is the same yesterday, and today, and forever.” Jesus says to all who come to Him for any of these seven blessings, “He that cometh unto me I will in no wise cast out.”
This is the Good News that God wants preached to every creature, so that every creature may have the privilege of enjoying “the fullness of the blessing of the Gospel of Christ.”
I say again that nothing is more God’s Word “settled in Heaven” than His redemptive name Jehovah-Rapha. No one has a right to change God’s “I am” Jehovah-Rapha to “I was.” The “Word of the Lord endureth forever.”
Since Jehovah-Shalom, “The LORD our Peace,” is one of Christ’s redemptive names, has not every man a redemptive right to obtain peace from Him? Has not every man, likewise, a redemptive right to obtain victory from Jehovah-Nissi? Has not every man a redemptive right to obtain “the gift of righteousness” from Jehovah-Tsidkenu, etc.? If so, why has not every man a redemptive right to obtain healing from Jehovah- Rapha? This word Jehovah-Rapha was so accepted and believed by those to whom it was first sent that “there was not a feeble person among all their tribes.” Whenever this state of health was interfered with by their transgressions, as soon as they repented, typical atonements were made. God was still Jehovah-Rapha the Healer, not to some, but to all. God wants this redemptive name, as well as all others, to be sent “to every creature” with the promise “they shall recover.” “The Lord shall raise them up.”
It will be well to note that they could not look at the brass snake and their symptoms at the same time. Abraham’s faith waxed strong while he looked to the promise of God.