the famous english author thomas carliel (1795 – 1881) speaks about the mercy characters of prophet muhammad (may allah’s praying and blessing be upon him) with words full of love and appreciation:

inside the great heart of this man – that has a great soul, full of mercy, peace, good, wisdom - some thought far from greed, and intentions that don’t seek for power or authority.

that is because he was faithful and serious with a big silent character…

 we may see others in high positions, living their lives lying and doing things completely different than their promises, muhammad in the contrary never said a lie, and he was a rare and unique great person.