True concentration itself is free from such contaminants. It is a state in which the mind is gathered together and thus gains power and intensity. We might use the analogy of a lens. Parallel waves of sunlight falling on a piece of paper will do no more than warm the surface. But if that same amount of light, when focused through a lens, falls on a single point, the paper bursts into flames.
True concentration represents a clear and undistracted state of the mind, which enhances its strength and intensity. In this manner, concentration allows for a focused mental energy that can lead to significant achievements, much like how a focused beam of light can create a powerful effect. This analogy highlights the importance of directing one's thoughts towards a specific goal for greater impact.
The author, Henepola Gunaratana, compares the mind's potential to a lens concentrating sunlight. When the light is scattered, it provides minimal effect; however, when it is concentrated, it can ignite fire. This serves as a metaphor for how focused mental efforts can lead to transformative results in mindfulness and overall mental clarity.
