All physical existence comes from the vibration of the One Infinite Consciousness (this, current science suspects, but does not yet believe, nor understand). Today, science does at least recognize that the Universe is composed of energy, whose source is vibration. Over 10,000 years ago, the ancient yogis discovered this cosmic energy/vibration as "Ohm". Einstein explained that all atoms vibrate and those vibrations come in quanta - thus, today's science is based on quantum physics. Thanks to quantum physics, we also now know that energy can neither be created nor destroyed. All the energy that was - is - will ever be - is already in the Universe. Atoms are made up of smaller quantum particles that are classified as either bosons or fermions. They both vibrate. Energy (vibration) is everywhere, even in the vacuum of deep space. Quantum physicists call this deep space energy "zero point energy (ZPE)".
When you deeply believe in something, you draw on this cosmic energy, which in turn creates a magnetic field of attraction around you, attracting to you your desires and beliefs. This is the true explanation of The Law of Attraction.
I hope this helps you better understand today's affirmation for success from Swami.