Sincerity neither carries personal interests nor supports that.

The sincerity does not need, thanks, but just for one's emotion expression; it is a beautiful way for that.

The sincerity does not need, thanks, but just for one's emotion expression; it is a beautiful way for that

The sincerity that fragrances in your words and conduct; factually, it is not present in your heart.

Friendship or any relationship based on purposes than the sincerity does not improve and nor stay long.