Believe well and have well.

The saying connects a confident expectation of good with receiving or experiencing good. It urges a person to approach an uncertain outcome with trust rather than assume the worst.

Its force is encouraging rather than predictive: confidence and a good outcome are presented together, but the words need not imply that belief alone can make a desired result happen.

Use it to reassure someone who is anxious about how things will turn out, inviting them to expect a good result. It should not be used as a promise that optimism will guarantee success.