I leave you the best quotes from Carl Rogers, an influential psychologist in American history, who together with Abraham Maslow founded the humanist paradigm in psychology.
Carl Rogers is the author of more than 10 books on psychotherapy and psychology, including The Process of Becoming a Person (1979), Counseling and Psychotherapy (1942/1978) and Client-Centered Psychotherapy (1951).
You may also be interested in these quotes from great psychologists or these from Abraham Maslow.