The phrase "a source of confidence" is correct and usable in written English.
You can use it when referring to something that provides assurance or self-belief in a particular situation.
Example: "Her extensive experience in the field served as a source of confidence for the entire team during the project."
Alternatives: "a wellspring of confidence" or "a foundation of confidence."
She called that "a source of confidence, and reassuring".
Panesar had been recalled to bowl at the fresh batsmen, a source of confidence in the left-armer in itself.
Last season, he said the award was a source of confidence when he backed up Russell for a second consecutive season.
All we have to lose is the timidity which prevents us from embracing our European destiny and from recognising that it is a source of confidence in our nations future.
The mission of the campaign, said Fernando Machado, the global brand vice president for Dove Skin at Unilever, is "to create a world where beauty is a source of confidence and not anxiety".
History is not a source of confidence.
He has managed to surprise all in Washington, London and Arab capitals with his ability to absorb the strikes of the first days of confrontation, to turn the psychological war directed against him into a source of self-confidence, and to manipulate America's overwhelming military superiority in his favour.
This budgetary strength was a source of political confidence.
But that feel is also a limitation, often translating as a lack of focus and a source of false confidence.
Her appeal is in essence to past achievements to a huge rise in employment and real wages, both of which are only just starting to move into reverse.Similarly, the Mineirão disaster showed that Brazilian football is no longer a source of national confidence.
It has been an unqualified success in Ms. Tahirovic's community, as well as a gratifying experience for her and a source of new confidence from her peers.
