Techniques For Contemplation- Worship of a Deity
The method to be followed in contemplation of a deity or an idol like Sri Rama, Krsna, Hanuman, Ganesa, Siva, Visnu, Buddha, or Jesus is that you must remember him as though he is just behind you, looking over your shoulders, watching over what you are doing, guiding you and leading you from morning to evening — that is saguna upasana (worship of the manifest).
His qualities come automatically to the mind and, in due course, you find that your values have changed. For example you cannot think of Mahatma Gandhi without the idea of nonviolence arising in your mind.
Buddha brings into your mind peace and tranquility. On the other hand, when you think of Hitler your mind will be tainted by his cruelty and atrocious crimes.