Formal spiritual practice is the very fundament for anyone who truly desires to consciously grow and unfold. It is through this formal practice that we make ourselves increasingly open and available to catch insights as to that which is true and real. That we may release and let go of the small and limiting beliefs and perceptions that keep us from going further. That keep us at the level of consciousness that we presently are at.
However we must never forget to use the moments in between to build spiritual muscles as much as we can. It is in those moments in between the formal practice that we are really strengthening those muscles.
Like Eckhart Tolle reminds us, it is one thing to have a regular practice of formal meditation, lets say in the morning. And a totally different other to maintain that level of presence throughout the day.
In other words, formal meditation, although beautiful and powerful, is not enough. Formal praying, although powerful and magnificent, is not enough. The same with forgiveness, visioning and surrendering. But it is what we do in between those moments of formal practice that truly builds those spiritual muscles we need.