Satan has many ways of tearing us down. One of his most destructive means of doing so is to tell us that we are not physically, emotionally, or spiritually able to do something. He strikes us down by telling us lies like, "You can't pass this test", "You're not good enough to make the team", or "You'll always be single". The sad thing is that it is easier to believe his lies rather than trust that we can do something.
During the times in my life where I feel like I can't do something, I repeat in my head Philippians 4:13, which states, "I can do everything through him who gives me strength." This verse, that promises us that there is nothing that we cannot do through Christ, allows us to not worry about whether or not we are capable of doing something.
It is important to understand though, we cannot merely depend on our own strength; we must call upon the name of the Lord and rely on His power. So, as you go throughout your day and you are faced with certain trials, give it all up to God. He has promised to always be there for us and to help us through our tough times. Don't believe Satan when he tells you that you are not capable of doing something; instead, remember to call upon the name of the Lord and use the strength that only He can provide.