the mind > attention and judgement > testing > proof, demonstration > prove, demonstrate [verb (transitive)] > by practical means (3)
transitive and absol. To have proof of; to learn or know by experience. Obsolete.
To demonstrate practically or to the experience of others, display, exhibit, make proof of. Also reflexive.
To support or uphold by satisfactory evidence; to back with proofs of a practical or substantial character.