Personal integrity reaches its height in the absence of pretense. The truly decent character has searched his/her heart, knows it well, and strives to keep it pure. This takes a great deal of persistent mindfulness.
Sincerity of heart and purpose means harboring no hidden agendas. Sincere folks don’t try to get things in a slimy, underhanded, or undeserving way. They’re as true to themselves as they are authentic to others.