met vriendelijke groet in English:

I sincerely hope for his happiness.

I sincerely hope that you will soon recover from your illness.

I sincerely regret having caused you such an inconvenience.

His employer was sincerely grateful for his cooperation.

I have amongst my relatives, a single one who sincerely lives righteously, has strict principles and pursues an ideal, but all my other relatives speak ill and make fun of him.

If someone is already good in and of themselves, however, and treats you sincerely and from the heart, and truly loves you, then you really can entrust your life to them.

If only you work sincerely, you will be trusted.