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Una posibilidad.
Saludos.

Este 'appreciate' me parece (en lo que estoy de acuerdo c/ Mercedes Marta y Ana Catarina) que no es tanto cuestión de valorar ni agradecer, cuanto de reconocer, tener en cuenta. Propuesta:

"El desarrollo de las habilidades de pensamiento. ... Andrew P. Johnson ... tengan en cuenta las perspectivas culturales, religiosas y políticas de otros alumnos..." books.google.com/books?isbn=9501631001

"... edad que requieren cuidados, para lo que hay que tener presente las normas que .... las actitudes y las capacidades en la esfera social, económica, cultural y..." www.cocmed.sld.cu/no114sp/ns114rev2.htm‎

En mis respuestas anteriores había puesto “valoren”, porque entiendo que “valorar” implica considerar el valor “viendo” unos rasgos específicos que se pueden considerar positiva o negativamente... pero si queremos matizar o hilar fino, creo que podemos “evaluar” o “evaluar exhaustivamente”, “estimar el valor con ponderación”... o incluso “intentar valorar de forma objetiva”, pues al hacer eso aprendemos...

Si cuando yo hago una pregunta tengo que ver todas las respuestas y valorarlas, evaluarlas, considerarlas... y en el proceso aprendo mucho... y a veces es un dilema elegir la mejor respuesta... pues todas me han ayudado a una mejor comprensión del original...

Bueno, evalúa mi respuesta en su justa medida, y valórala o estímala en función de lo que hayas aprendido...
(Como escribía Richard Back en Ilusiones: “Enseñamos mejor lo que necesitamos aprender”... citado de memoria, así que no me citen).

Suerte y un saludo.

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Note added at 7 hrs (2013-12-10 01:05:28 GMT)
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Darse cuenta, entender, comprender, hacerse cargo.

Estudiando “appreciate” en las definiciones y estudio de sinónimos, incluidos, otra posible redacción (aunque algo más verbosa) sería:

Ejerzan su propio criterio para comprender profundamente el espíritu...

(No veo sito para "refs." con lo que lo incluyo aquí:)

Merriam Webster’s Unabridged Dictionary:
* A.
transitive verb
1 a (1) : to evaluate highly or approve warmly often with expressions or tokens of liking *to be loved, to be appreciated, to be admired and highly valued Theodor Reik* (2) : to judge or evaluate the worth, merit, quality, or significance of : comprehend with knowledge, judgment, and discrimination *incapable of appreciating the difference between right and wrong B.N.Cardozo* *appreciated that a new era was beginning David Fairchild* *my power of appreciating your many charms and my desire that you should become my wife Samuel Butler *1902* b : to judge with heightened perception or understanding: (1) : to be critically and emotionally aware of delicate subtle aesthetic or artistic values *he could not appreciate artistic quality* (2) : to be fully sensible of often through or as if through personal experience *must be experienced to be appreciated Rudyard Kipling* c : to esteem highly and express thanks or gratitude for *I appreciate your kindness but I should be much happier alone Louis Bromfield*´

*B
APPRECIATE stresses full and just perception, especially of value, arrived at with insight and discrimination *I could not appreciate its excellence, having no background of previous displays to use for purposes of comparison Robert Graves* *fully to appreciate the American experience T would require a rehearsal of the whole of American history H.S.Commager*

*C
APPRECIATE connotes recognition of worth or merit through wise judgment, analytical perception, and keen insight *the author appreciates the historical development of the Roman law and the character of its various sources H.O.Taylor* *he liked to be near people and have his talent as a whittler appreciated Sherwood Anderson* It is rarely used without these notions, although in less precise use it may carry added notions of warm hearty approval or full or delicate enjoyment *attach herself to someone who knew how to appreciate the fullness of her ardor Morley Callaghan* *youth appreciates that sort of recognition which is the subtlest form of flattery age can offer Joseph Conrad* In this series VALUE is less rich in suggestion than the others. It may suggest judgment blending the analytic and the subjective *she only valued rest to herself when it came in the midst of other people's labor Thomas Hardy* *suddenly Gard was smitten by the tragedy of plain women; to be valued, but not loved Mary Austin*

*D
Random House Webster’s Unabridged
—Syn.2. APPRECIATE, ESTEEM, PRIZE, VALUE imply holding something in high regard. TO APPRECIATE is to exercise wise judgment, delicate perception, and keen insight in realizing the worth of something. TO ESTEEM is to feel respect combined with a warm, kindly feeling. TO VALUE is to attach importance to a thing because of its worth (material or otherwise). TO PRIZE is to value highly and cherish.