Why belief?? Believing in yourself is absolutely different, evidently. But ideas about the future, trust in books that your mind claims as holy, this obsession with the words of others who are proclaimed saints and/or “learned.”
And not to mention stupid trust and obedience of traditions, cultural history and ideologies. You might be old in age, but you do not have to remain attached to this nonsense.
Or you might be young and full of knowledge and fantastical ideas from other people, from gurus, from books, and from your own imagination even; however, you want to see the truth and awake, but beliefs are not the way–beliefs are what keep you asleep and ignorant or unwise.
A healthy mind is an empty mind, which is not actually empty; but it is indeed empty of any attachments to beliefs, ideas, traditions, cultures. In order to know yourself and ALL existence, you must empty yours from any attachment whatsoever.
It is your own mind after all, and it shows you your life based upon its content. If all you have in your mind are beliefs, traditions, attachments to ideas and philosophies, then you will live in this illusion created by the attachment to all this.
Free yourself from the illusions you carry. Practice an empty mind, such mind is fresh, insightful, open-minded, young no matter your age, wise and ready to accept any change and new idea.