Hexagram 27, Nourishment (Yí, 颐), is formed of the upper trigram Mountain (艮) over the lower trigram Thunder (震). Below is the classical judgment, the six line texts, and how to read this hexagram in a reading.
The Judgment
Perseverance brings good fortune. Watch what one nourishes — and how one seeks one's own filling.
贞吉，观颐，自求口实。
Trigrams
☶
Upper · Mountain 艮
keeping still
☳
Lower · Thunder 震
arousing movement
The outer (upper) trigram Mountain describes the situation as it meets the world; the inner (lower) trigram Thunder describes its inner disposition. Together they set the theme of Nourishment.
The Six Lines
初九 · Line 1 Setting aside your own magic tortoise to gape at my food — misfortune.舍尔灵龟，观我朵颐，凶。
六二 · Line 2 Seeking nourishment upside-down, straying uphill for it: advancing brings misfortune.颠颐；拂经于丘颐，征凶。
六三 · Line 3 Rejecting right nourishment: persistence bodes ill. Ten years useless — nothing furthers.拂颐；贞凶，十年勿用；无攸利。
六四 · Line 4 Seeking nourishment from below, watchful as a tiger, hungry and intent — no blame.颠颐，吉；虎视眈眈，其欲逐逐，无咎。
六五 · Line 5 Against the usual way: abide steadfastly, good fortune — but do not cross the great water.拂经；居贞吉，不可涉大川。
上九 · Line 6 The source through whom all are nourished: aware of the danger, good fortune. It furthers to cross the great water.由颐；厉吉，利涉大川。
Reading Hexagram 27 for Your Question
When Nourishment appears without changing lines, the judgment above stands as the whole answer. When you cast changing lines (a 6 or a 9), read those line texts first — they are the most specific guidance — then look to the relating hexagram they form for where the situation is heading. For love, career, or a decision, apply the theme of Nourishment to your own circumstances rather than reading it as a fixed prediction.
Ask the oracle your own question and see whether Nourishment answers.