Comfort is the feeling of being at ease. Comfort is not something that you easily get. Comfort is a purely relative term, can be associated with several things. Frank A. Clark has rightly said, "We find comfort among those who agree with us, grow among those who don't". You feel comfortable when you are with like-minded people, people who have similar mindset or people with whom your frequency matches.
But, there are people who differ with you on several issues. You can never feel comfortable in their company. But, this clash of opinions and thoughts is bound to happen because each of us is a completely unique creation of God and will definitely have a different viewpoint on each issue. This helps us to grow, because when opinions clash, you tend to discover the positive as well as the negative aspects of anything. So, blend even with those people who are not like-minded.