The Dangers of Wilful Practice

How is it possibly to engage whole-heartedly with life's activities and challenges without always having the end game of "I'm doing this in order to get that" ambition? This is the usual function of our everyday mind that would even resort to strong wilfulness in order to fulfil its desires. Our training is to discover the mind that doesn't engage with wilfulness or pushy ambition, and yet still engages wholeheartedly with life and its never ending challenges.