Happiness and suffering are states of mind, and so their main causes cannot be found outside the mind.
The cause of happiness and the solution to our problems do not lie in knowledge of material things. Happiness and suffering are states of mind, and so their main causes cannot be found outside the mind. If we want to be truly happy and free from suffering, we must learn how to control our mind.
Faith is like pure eyes that enable us to see a pure and perfect world beyond the suffering world of samsara.
When we want a cup of tea our main wish is to drink tea, but to fulfill this wish we naturally develop the secondary wish to find a cup. In a similar way, the main wish of those who have great compassion is to protect all living beings from their suffering, but to fulfill this wish they know they must first attain Buddhahood themselves and so they naturally develop the secondary wish to attain enlightenment.