feel that one has not done anything wrong; feel no qualms upon self-examination; have a good [clear] conscience; one's heart is in the right place
Related Translations:
扪心: touch or feel one's heart by hand; examine one's conscience
清夜扪心: examine one's conscience in the stillness of night -- self-examination; search oneself for mistakes in the stillness of night
无愧: feel no qualms; have a clear conscience; be worthy of 短语和例子当之无愧 be worthy of the name; 问心无愧 feel no qualms upon self-examination; 无愧于人民的信任 prove worthy of the people's trust