O you who have attained to faith! Do not deprive your charitable deeds of all worth by stressing your own benevolence and hurting [the feelings of the needy], as does he who spends his wealth only to be seen and praised by men, and believes not in God and the Last Day: for his parable is that of a smooth rock with [a little] earth upon it - and then a rainstorm smites it and leaves it hard and bare. Such as these shall have no gain whatever from all their [good] works: for God does not guide people who refuse to acknowledge the truth.