This is a break in Jesus teachings, as verse 14 tells us background information about how the Pharisees ridiculed Jesus. In verse 15, Jesus continues teaching and responds to the Pharisees. (See: [[rc://en/ta/man/translate/writing-background]])
Here "hearts" refers to the desires of people. AT: "God understands your true desires" or "God knows your motives" (See: [[rc://en/ta/man/translate/figs-metonymy]])
This can be stated in active form. AT: "Those things that men think are very important are things that God hates" (See: [[rc://en/ta/man/translate/figs-activepassive]])