If you're not achieving great results through thought, its because you have not really devoted yourself to this work in previous incarnations

"You decide to live your life more according to your spiritual ideal by devoting more time to prayer and meditation. A week or ten days go by, and as you find there is little change you say to yourself: ‘This is a waste of time. I'm not achieving anything.' Well, this proves you do not know the laws of spiritual work. If you are not achieving great results through thought, it is because you have not really devoted yourself to this work in previous incarnations. Your psychic matter has become so opaque that it is putting up great resistance, and in order to change it, to make it sensitive, you will need a great deal of time. If you had already spent time working towards achieving this end, your matter would now be far more flexible, malleable, and easy to educate. This preparation would have made the work of the spirit easier within you. The spirit is the greatest power that exists, but you have to understand the conditions in which he thrives. So, do not waste precious time prevaricating; begin your spiritual work today."