Companies spend time and resources training their employees, but the onus on being fit for the job ultimately boils down to the individual, says Paul Kelders, CEO of marketing company Jump Innovation. "I have this acronym that I use: N.I.C.E.," he told CNBC's My Biggest Lessons. "It's just really good for the soul to help us calm the mind and encourages creative thinking," he explained. Doing this helps "to develop our own thinking, and our own ways of viewing things," which helps ensure diverse ideas in the workplace. Being "NICE" is just one of Paul Kelders' biggest lessons.

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Persons: Paul Kelders, CNBC's, Kelders, It's