Paul is encouraging Timothy to do the job with the preparation that he has been given. Each has spiritual gifts for use in the local assembly. Each has spiritual knowledge to share with others. Which some professing have erred concerning the faith. Man tends to think himself to be very smart.
Cosmology seeks to explain creation.
Philosophy seeks to explain life. Theology seeks to explain God. Psychology seeks to explain the mind. Recently a new ology has shown up in stores. Not sure what it seeks to explain other than how your money transfers from your pocket to theirs though.