"Under the circumstances" is a place where it would be easy for you to pile on some negative thinking that can weigh on self confidence and motivation.
Faith is a popular subject in motivational quotes because it is the opposite of doubt, and one of the cornerstones of inspiration that can provide a foundation of confidence.
A definition of faith quoted in the bible is “the substance of things hoped for”. This invisible substance can be elusive, but it can be a catalyst for motivation if you can manage to have some, even as little as a mustard seed.
If you have a choice to be confident or worried, which one would you choose? The answer seems obvious, but you may worry by default, unless you make a deliberate choice.
Books on how to be confident and are plentiful, as well as a variety of different methods on how to stop worrying, but there is yet another easy way to build self confidence and improve self esteem - by making a choice between two completely opposite thoughts.