Read Luke 9.
This chapter began with Jesus sending out the Twelve to give the gospel and to do miraculous works to authenticate their message (vv. 1-2). Jesus told them to take nothing so that they would learn to rely on God’s provision for everything (vv. 3-6).
God did provide for them and he used them powerfully to serve Jesus (v. 10). But they did not completely learn the lesson. When food was needed for a large crowd, the Apostles wanted Jesus to send the crowds away (v. 12). Jesus challenged their thinking and commanded them to feed the crowds themselves which they protested (vv. 13-14). Christ showed them once again that he had the power to meet every need they had in ministry. But the implication is that, if they’d had trusted him, they could have fed the crowd themselves through his power (vv. 16-17).
When we’re serving God, we can trust him to meet every need we have. He has more than enough power–infinite power, in fact–to meet every need we have and then some. The question is not whether or not God can provide. The question is whether or not we look to him in faith to provide for our needs or if we conclude in unbelief that it cannot be done with the present resources.