There is Wisdom in NOT trying to play God and Lord it over people or prove our superiority and claim our exclusive place among God's people. Joshua attempted to convince Moses simply because he felt the God's Spirit was upon men who didn't have what it took to prophesy. With this kind of actions comes ungodly and unnecessary tussles, rivalry and deep disharmony.
There's a need to open up our hearts to God in prayer; and submit our desires to God's purifying word by helping others express the grace of God in them for the good of the community of God's people.