carefulness
恪 centers on a respectful, careful attitude: acting with conscientiousness and mindful restraint.
恪 combines 忄 (heart/mind) with 各, which likely contributes the sound. The character expresses a careful, respectful mental attitude.
The heart radical 忄 beside 各 suggests a mind that treats each (各) thing with careful attention. Picture someone handling every task with a respectful, cautious heart.
For カク, imagine a careful clerk (カク) meticulously checking every document: clerk -> カク, and the clerk's heart is full of carefulness.