Happened to see this excerpt, liked it a lot.
The five spiritual faculties – faith, energy, mindfulness, concentration, and wisdom – are our greatest friends and allies on this journey of understanding. These qualities are most powerful when they are in balance. Faith needs to be balanced with wisdom, so that faith is not blind and wisdom is not shallow or hypocritical. When wisdom outstrips faith, we can develop a pattern where we know something, and even know it deeply from our experience, yet do not live it. Faith brings the quality of commitment to our understanding. Energy needs to be balanced with concentration; effort will bring lucidity, clarity, and energy to the mind, which concentration balances with calmness and depth. An unbalanced effort makes us restless and scattered, and too much concentration that is not energized comes close to torpor and sleep. Mindfulness is the factor that balances all these and is therefore always beneficial.
~ Joseph Goldstein, in Seeking the Heart of Wisdom