A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit. Matthew 7:18
The character, as well as the ability of the maker, is visible in the thing that he makes. If a good tree cannot bring forth evil fruit, then it is certain that the great Creator of all, who is holy in all His ways and righteous in all His works, who is good and only doeth good and whose tenderness is over all His works, can design nothing the end of which is not pure happiness and usefulness. Whatever catastrophes may have intervened, and however mysterious are the processes by which His goal will be reached, it follows, from the fact of His unimpeachable character, that the consummation of His work will justify all His methods.
If He employs the discipline of a father, the sacrificial love of a mother, the stern justice of a judge and the passionate affection of a husband and all these are figures chosen by Himself to set forth His attitude towards men and His work for and in them it is to the end that His great designs of love may ultimately triumph. If He turns men to destruction, it is that He may say, “Return ye children of men.” (Ps. 90:3). If the vessel is marred in the hand of the Potter, it is that He may make it again another vessel. (Jer. 18:4). If His work is marred, then His own face will be more marred than any man’s, that He may buy back those who have sold themselves for nought. Creation is full of mysteries, but the revealed character of the Creator suffices to assure us of a triumphant solution to them all. Only a traitor to His person and character would deny such a God this certainty.
From God in Creation, Redemption, Judgment and Consummation by A.E. Saxby. You can read the complete document here.