Purity of intention. The suggestions of pride and the impulses of the flesh are not difficult to recognize... and you fight and, with grace, you conquer.
But the motives that inspire you, even in the holiest actions, do not seem clear; and deep down inside you hear a voice which makes you see human reasons in such a subtle way that your soul is invaded by the disturbing thought that you don't act as you should for pure Love, solely and exclusively to give God all his glory.
React at once each time and say: 'Lord, for myself I want nothing. All for your glory and for Love.'