There is a right way of doing things and a wrong way of doing things. Strife (meaning faction or contention), vainglory (meaning empty glory, or self-conciet). Here we are warned by Paul to watch out for these attitudes in our attempt to serve the Lord. The danger is that we can spin our wheels to serve the Lord with all meaninglessness, and accomplish nothing. If we don't purposefully think about these things we could be in danger of falling into these subtle traps. In essence we become what we abhor, when we forget to fight the good fight of faith.