Visualizing your goals and dreams is a part of succeeding in your life and career that you can't avoid. I am a big advocate of having a vision for your life with as much detail as possible. I want you to not just see, but be able to taste, hear, smell, and feel the vision you have, as big and bold as possible.
Yet, if you know me and read this blog, you know that I also decry a lot of the "visualization" exercises and self-help approaches out there. I despise "The Secret" and it's offspring and it's siblings; the idea that if you visualize it it will happen, the dream-and-be-positive exercises, and all the rest. Yes, I advocate visualization while decrying some visualization methods and exercises.
There's a reason for what seems to be inconsistency. This reason is not visualization itself, but the attitude taken towards in the various exercises people promote. I'm all for having big dreams, as visceral as possible – but its what those visualizations mean to you that changes what they can do for you.