Je Tsongkhapa mentioned in The Great Treatise on the Stages of the Path to Enlightenment that bodhicitta and the mind of renunciation are very important, but that depending on these alone would not overcome ignorance. In the end, we still need the view of emptiness. This is like going to the doctor to be treated for an illness—the key to curing the illness depends on whether or not its root cause is understood. If not, it is impossible to give the right prescription. Similarly, the reason that we are not liberated (from samsara), not at ease and not free, is not mere coincidence, nor an occurrence without any cause. Neither is it due to the will of an omnipotent God. The root cause indeed originates from attachment. 

~ Luminous Wisdom Book Series 10