Peace comes when we stop being the controllers.
To have mental concentration one must be cheerful and peaceful. By cultivating friendship with equals, respect for seniors, compassion for juniors and indifference towards sinners one will destroy envy, hatred and aversion and become happy and serene.
Srila Prabhupada stressed 4 rules in japa: early morning chanting, full concentration, distinct pronunciation, attentive hearing.
If someone tries to love someone, they are very sincere because sincerity is one aspect of love. So if we are trying to love Krishna, we should pray – Krishna, I want to do my japa properly, sincerely. Please help me.