He who does a kindness to an ...

He who does a kindness to an ungrateful person, sets his seal to a flint and sows his seed upon the sand; on the former he makes no impression, and from the latter finds no product.
He who does a kindness to an ungrateful person, sets his seal to a flint and sows his seed upon the sand; on the former he makes no impression, and from the latter finds no product.
 Robert South

More phrases

Teach your children gratefulness. Do all you can to deliver them from our culture's poisonous entitlement mentality.
 Randy Alcorn
Death is at any time blessed but it is twice blessed for a warrior who dies for his cause, that is, truth.
If you pick up a starving dog and make him prosperous he will not bite you. This is the principal difference between a dog and man.
While we are grateful to all the brave men and officers for the events of the past few days, we should, above all, be very grateful to Almighty God, who gives us victory.
All men feel a habitual gratitude, and something of an honorable bigotry, for the objects which have long continued to please them.

Quotes from the same author

Defeat should never be a source of discouragement but rather a fresh stimulus.
 Robert South
Abstinence is the great strengthener and clearer of reason.
 Robert South
God expects from men something more than at such times, and that it were much to be wished for the credit of their religion as well as the satisfaction of their conscience that their Easter devotions would in some measure come up to their Easter dress.
 Robert South
Action is the highest perfection and drawing forth of the utmost power, vigor, and activity of man's nature.
 Robert South