Are my sentences using 'sense,' 'responsibilities,' 'come up with,' and 'strong' written correctly?

Are my sentences using 'sense,' 'responsibilities,' 'come up with,' and 'strong' written correctly?

The discipline officer in my cousins' school has stated that when he uses sanctions, he helps the students develop a full sense of their moral and ethical responsibilities. He mentioned further that without these sanctions, he cannot possibly motivate the learners to reflect on their conduct, come up with informed decisions, and cultivate strong personal development skills.