So where is your verse from the bible telling you that God heals as he chooses?
Good point...for once.
Healing is a Dispensational issue.
As with one's proper understanding of the ceasing of the various gifts; which is dependent upon one's proper understanding of the completeness said gifts gave way to Dispensationally; so with the healing issue today, also this side of that which is perfect...
The better one understands both the above and one's completeness in Christ Dispensationally; the better one understands why God no longer heals today, nor needs to.
But if all one does is go against this assertion just because it does not fit one's understandings and or beliefs about a thing...
Well, that is not how the truly consistent Dispensationalalist responds to such assertions.
Rather; he buries his or her nose in Scripture "studying the Scriptures daily, whether those things are so..." Acts 17:11.
What was another reason behind why Jesus heal? And why did Lazarus die again?
I'll answer the first question three questions and two passages...
Who was Israel to have been?
Exodus 19:3 And Moses went up unto God, and the LORD called unto him out of the mountain, saying, Thus shalt thou say to the house of Jacob, and tell the children of Israel; 19:4 Ye have seen what I did unto the Egyptians, and how I bare you on eagles' wings, and brought you unto myself. 19:5 Now therefore, if ye will obey my voice indeed, and keep my covenant, then ye shall be a peculiar treasure unto me above all people: for all the earth is mine: 19:6 And ye shall be unto me a kingdom of priests, and an holy nation. These are the words which thou shalt speak unto the children of Israel.
Well guess what?
Leviticus 21:16 And the LORD spake unto Moses, saying, 21:17 Speak unto Aaron, saying, Whosoever he be of thy seed in their generations that hath any blemish, let him not approach to offer the bread of his God. 21:18 For whatsoever man he be that hath a blemish, he shall not approach: a blind man, or a lame, or he that hath a flat nose, or any thing superfluous, 21:19 Or a man that is brokenfooted, or brokenhanded, 21:20 Or crookbackt, or a dwarf, or that hath a blemish in his eye, or be scurvy, or scabbed, or hath his stones broken; 21:21 No man that hath a blemish of the seed of Aaron the priest shall come nigh to offer the offerings of the LORD made by fire: he hath a blemish; he shall not come nigh to offer the bread of his God. 21:22 He shall eat the bread of his God, both of the most holy, and of the holy. 21:23 Only he shall not go in unto the vail, nor come nigh unto the altar, because he hath a blemish; that he profane not my sanctuaries: for I the LORD do sanctify them. 21:24 And Moses told it unto Aaron, and to his sons, and unto all the children of Israel.
Any Dispy see two obvious implications in that?