Lord, who may be a guest in your home? Who may live on your holy hill? Whoever lives a blameless life, does what is right, and speaks honestly.
Ps 15:1-2 NET

How happy is he born or taught,
That serveth not another’s will,
Whose armor is his honest thought,
And simple truth his utmost skill.
—H. WOTTON

If thou workest at that which is before thee, following right reason, seriously, vigorously, calmly, without allowing anything else to distract thee, but keeping thy divine part pure as if thou shouldest be bound to give it back immediately,—if thou boldest to this, expecting nothing, fearing nothing, but satisfied with thy present activity according to nature, and with heroic truth in every word and sound which thou utterest, thou wilt live happy. And there is no man who is able to prevent this.
—MARCUS ANTONINUS