Do you really believe that man is sovereign at the same time that God is sovereign? If, so please how you are able to reconcile this belief in your own words. Thereafter, could you post Scripture to support that conclusion?
I don’t know what you mean by man is sovereign.
St. Thomas teaches that God, who is the Prime Mover, grants man grace which moves man’s will toward the good. It is all God at this point. God makes the first move. Thomas calls this “operating grace.” At this point, man can resist or not resist the grace. If man does not resist the grace, it is the grace that is allowing his nonresistance and cooperation. Then, by using his freewill, man can actually move toward the good, and the grace strengthens and supports his will toward that end. This grace is called “cooperating grace.” Both operating and cooperating grace are the same grace, but they produce two effects. The first is to move the will (by virtue of the grace alone); the second is to will the movement of the will (by virtue of the same grace along with human freewill). This is why Paul says, “for God is at work in you, both to will and to work for his good pleasure” (Phil 2:13). God’s grace first moves the will to the good, and then leads the person to work the good.
In1Tim 2:4, Paul reveals that God desires “all men to be saved and to come to the knowledge of the truth.” However, man can resist this grace. When man habitually resists God’s grace so that He places himself in opposition to God, God withdraws His grace and allows the person to fall away. Thus, God antecedently wills all men to be saved, but consequently wills some to be damned as a punishment for their rejection of grace, as His justice exacts. Thus, salvation and damnation come from the same immutable will of God, who wills to save all men, but who also wills to punish evil.
**how long will you turn away at my reproof? Lo! I will pour out to you my spirit, I will acquaint you with my words. "Because I called and you refused, I extended my hand and no one took notice; Because you disdained all my counsel, and my reproof you ignored-- I, in my turn, will laugh at your doom; I will mock when terror overtakes you; When terror comes upon you like a storm, and your doom approaches like a whirlwind; when distress and anguish befall you. (Prov 1:23-27)
"Jerusalem, Jerusalem, you who kill the prophets and stone those sent to you, how many times I yearned to gather your children together, as a hen gathers her young under her wings, but you were unwilling! (Mt 23:37)**
Maybe we should look at this from another angle? How sufficient is the grace of God to accomplish what God intended? If grace is only a help to save those who utilize the grace of God, then man’s will is stronger than God’s grace in those who will be eternally lost. In those cases… those who do not cooperate with the grace of God and are lost, in that group… man’s will is greater than God’s grace. In the reprobates, man is sovereign over God.
God gives all men sufficient grace to be saved. This is true because God antecedently wills all to be saved, and He doesn’t command the impossible, meaning that all have the possibility of salvation. If the man is a member of God’s elect, then God also gives that man efficacious grace, which means he predestinates that man to heaven with the grace of final perseverance. In either case, the man is free to accept or reject the grace. But in the case of the elect, God wills the man to infallibly accept the efficacious grace (which is why it is efficacious), without taking away his freewill. That is how powerful God is. How God predestinates some through efficacious grace while giving sufficient grace to all is one of the greatest mysteries of our faith.
St. Thomas makes a distinction between grace that is intrinsically efficacious to achieve its end and grace that is not. With sufficient grace, God gives man the power to act but man resists. With efficacious grace, God actually moves man to act, even though man remains free to resist but does not. With the former, the power to act is in potency and is never actualized. With the latter, the power to resist is in potency and is never actualized. In both cases, man is free. Hence, it is the type of grace that God gives - sufficient or efficacious - that determines man.
Said another way, with sufficient grace man is able to cooperate with the grace to save his soul, but freely chooses not to, and God permits him to fall away. With efficacious grace, man is able to resist the grace but does not, because the grace causes him to freely choose the good. In both cases, man is completely free, but in the former, the resistance (which is an evil) comes from man, while in the latter, the non-resistance (which is a good) comes from God.