He has a sincere desire to help you.

他是诚心诚意地想帮助你.

《现代汉英综合大词典》

Life's long road, to seek at heart a sincere desire to live.

漫漫人生路,上下求索, 心中渴望真诚的生活.

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I had a sincere desire to help her, so I told her with simplicity and sincerity.

我真诚地想帮助她, 所以坦率、诚恳地告诉了她.

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