We become whatever our attention rests upon most often. When our attention rests upon something, the vibration of that thing is consumed and taken inside of us. We digest that vibration and it becomes us. If we have certain desires, habits and addictions, their vibrations become our dominant vibration and their flavor permeates our thoughts, words and actions. Our desires, habits and addictions become the dominant impressions within us and we are literally covered within by them.
When we keep our attention on competition, success, image, accumulation and achievement, we can become attached to an outward outcome that measures worth and sufficiency in material terms. When we keep our attention on partying, drinking, gambling, drugs, pornography or excessive sex, we can become attached to distraction, self-cherishing pleasures and ego. When we keep our attention on God, saints, service and the Self and perform all our actions with our mind concentrated on the Divine, letting go of attachment and aversion, and looking upon success and failure with an equal eye, then we become attached to the Divine and spirituality.
We are going to consume the vibration of whatever we put our attention on, so it is up to us to determine what we will become. We will become what we attend to. Do we wish to become the ego, the distraction or God? Spirituality implies equanimity, and when our attention is habituated to rest on the spiritual, on God, then our mind rests in peace, compassion, silence and bliss. In each moment we choose what we become.
Blessings,

Understanding it intellectually but difficult to make sense of it in real life and moment to moment awareness.