It is in our worldly nature to just do things without thinking to rely upon God. As we mature in Christ we start to notice the things that we should rely upon God with. Which is all our worries, no matter how small we think the matter is.
It is so easy for us to fall back on our own strength when we should be relying upon the Holy Spirit to guide us. He is in direct contact with the Father. We should heed to His voice.
We should be still at moments when we feel the Holy Spirit trying to guide us. We should not ignore these times. It is hard to tell someone how easy it is to miss these nudges because of our carnality. We let the world influence us when we do not realize it.