Aboveboard

Definition: straightforward, honest; without deception; not concealed, in open sight

Derivation: from the difficulty of cheating at cards when the hands are above the table

Quotes:
• We aim above the mark to hit the mark. — Ralph Waldo Emerson (1803-1882) American Philosopher
• Two things awe me most, the starry sky above me and the moral law within me. — Immanuel Kant (1724-1804) Prussian philosopher