As a tool for organizing our life, "control" is a useful thing. But when we use the past to "control" our life, we often block our own healthful growth.
"Letting go" is the antidote to unhealthful control, and hence we get the principle: "We can let go of the past, and of the future."
For five minutes at the beginning of your day, sit quietly in a quiet place. Think about ways in which you feel "blocked" in your own life. Say clearly and silently to yourself, "In this situation regarding …(fill in the blank)…, I sometimes feel blocked." Then, thoughtfully consider whether some preconceived idea you have, based on past experience or habit, keeps you from moving beyond that block. If so, say silently, "My preconceived ideas about …(fill in the blank)…, keep me from my full potential." Now, as honestly as you can, be willing to "let go", and affirm this by repeating the following thought slowly, again and again, "I can let go of the past, and let go of control, that I may reach my full potential."
Throughout the day, whenever you find yourself blocked by ideas from the past, say quickly and silently to yourself: "I can let go of the past, and let go of control, that I may reach my full potential."