The phrase "corner stone" refers to a foundational and important element or principle, upon which something is built or established.
Sentences with «corner stone»
Various research studies have proved that a basic sense of emotional and existential security is a crucial corner stone in healthy child development. (positive-parenting-ally.com)
11 He is the stone which was rejected by you, the builders, but which became the chief corner stone. (religion.blogs.cnn.com)
You should set up a time limit and check / assess your career statements as corner stones. (job-interview-site.com)