The purpose of human life is self-realization. Part of self-realization according to the Bhagavad Gita is to have a heart clean of lust, greed, pride, anger, envy and illusion. Other symptomatic qualities such as rebellious mood, unsubmissivness, independent material thinking, challenging/argumentative mood etc arise from the primary six impurities of the heart.
It is a fact that every individual of this world possess these qualities otherwise Krishna has no need to talk about it. Therefore our fundamental purpose is to clean our heart. Simply chanting 16 rounds and going to temple to associate is not the purpose. If we do not introspect our motivations every moment, we will simply be focused externally on problems and solutions. However if we have a mood of introspection, then whatever good or bad happens to us, we will think what is Krishna trying to teach me now from this incident or action?
Like this when one meditates on one’s inner heart constantly and prays to the Lord to help clean it, Krishna will swiftly remove our anarthas (unwanted desires) and only then can we fix our consciousness in steady manner upon the Lord thus paving way to pure devotion. Only then will we be able to always remember Krishna and never forget Him so even at death our consciousness will be fixed on the Lord thus making our life successful.
A sincere and serious individual who aspires to be spiritual will always be in the mood of humble introspection and prayer. Anything not this will lead to pride.