The word(s) "thought" appears 30 time(s) in 29 verse(s) in Quran in Abdullah Yusuf Ali translation.

(11) With it He produces for you corn, olives, date-palms, grapes and every kind of fruit: verily in this is a sign for those who give thought.

(12) (We sent them) with Clear Signs and Books of dark prophecies; and We have sent down unto thee (also) the Message; that thou mayest explain clearly to men what is sent for them, and that they may give thought.

(13) Then to eat of all the produce (of the earth), and find with skill the spacious paths of its Lord: there issues from within their bodies a drink of varying colours, wherein is healing for men: verily in this is a Sign for those who give thought.

(14) And they will be marshalled before thy Lord in ranks, (with the announcement), "Now have ye come to Us (bare) as We created you first: aye, ye thought We shall not fulfil the appointment made to you to meet (Us)!":

(15) One Day He will say, "Call on those whom ye thought to be My partners," and they will call on them, but they will not listen to them; and We shall make for them a place of common perdition.

(16) "Those whose efforts have been wasted in this life, while they thought that they were acquiring good by their works?"

(17) Those who fear their Lord in their most secret thoughts, and who hold the Hour (of Judgment) in awe.

(18) Behold, ye received it on your tongues, and said out of your mouths things of which ye had no knowledge; and ye thought it to be a light matter, while it was most serious in the sight of Allah.

(19) She was asked to enter the lofty Palace: but when she saw it, she thought it was a lake of water, and she (tucked up her skirts), uncovering her legs. He said: "This is but a palace paved smooth with slabs of glass." She said: "O my Lord! I have indeed wronged my soul: I do (now) submit (in Islam), with Solomon, to the Lord of the Worlds."

(20) And he was arrogant and insolent in the land, beyond reason,- He and his hosts: they thought that they would not have to return to Us!