For each call, God has the exact measurements

“I cannot walk with these, for I have not tested them.” So David took them off. 1 Samuel 17:39

God chooses people so that they represent Him; He delegates responsibilities upon them that only pertain to them, for He so arranged it. No one else can take that place; only God has the dominion to do so.
Those who are volunteers do not prosper, for God is the One who calls. That is why David, when he went to fight Goliath, was not able to put on Saul’s suit; for we can never wear something that has not been designed for us. What God gives us is for our call, which we need to know. Inasmuch the one He called, He trains and gives him the garments that will cover him; said garments will testify that He himself called him.
We cannot take on positions that are not ours just because this pleases us. It is necessary to be in the position that corresponds to us, which was given by God and has all divine support. Although we see that someone else’s is better, more effective, stronger, it is not. Because, for each call, God has the exact measurements of the suit that must be worn.