Considering proper thoughts
The parsha begins with Hashem commanding Avraham to leave his homeland and to travel to an unknown destination. We know that Hashem intended to take Avraham to the land of Canaan, a prosperous and beautiful land promised to be given to his descendants. However, Avraham didn’t yet know his destination. As a means of an introduction to what was in store for Avraham and his descendants, Hashem promised him tremendous blessings. Wealth, prosperity and fame were to await him. Hashem told Avraham that those that bless him will themselves be blessed, and those that curse him will themselves be cursed. However, the verse is presented with an anomaly. Regarding blessings, Hashem first said what He will do, and then said the subject of His action. He will bless those that bless Avraham. However, regarding curses, Hashem preceded the subject to the verb. Those that curse Avraham will be cursed. Why did Hashem speak this way and change the order?
Usually, an organized person will formulate their thoughts before they speak. They will consider their choice of words, the content, and the order, and then speak out what they’ve decided to say. There’s a rule that Hashem takes a person’s good thoughts and considers them as if they had been actualized. If a person intended to do a mitzvah, Hashem considers it as if they had done it, even if they were prevented from doing so. However, this is not true for improper thoughts. If a person considers doing a transgression, Hashem doesn’t consider it actually done unless the person themselves carries it out.
Let’s apply this rule to prayer. When a person seeks out Hashem’s help and beseeches mercy and assistance, before they vocalize their request, they have thoughts to turn to Hashem. As such, Hashem already considered it as if they had made this request. Hashem, in His infinite mercy, answers the request before they even speak it out. This is unlike a human being, who doesn’t know what the other is thinking until they are told. Hashem, who can plumb the depths of a person’s heart can fulfill all the requests of the person’s heart.
There’s a verse in Proverbs which alludes to this concept: “A person may arrange their thoughts, but Hashem provides the ability to speak”. In fact, this verse is answering a question. If Hashem knows our thoughts, why then does He require us to vocalize our request? The answer is that Hashem gave us the ability to speak. He desires our prayers. Hashem is (so to speak) like a father delighting with his young child. If the child requests something from the father, even though the father knows his child’s needs, the father gets pleasure from the request. Hashem therefore enjoys when we articulate our requests, even though He knows what we want before we even say.
Therefore, Hashem was very precise with His words to Avraham. Hashem will bless those that think to themselves bless Avraham, before they even do so. Hashem knows their thoughts, and considers those thoughts as if they had already been carried out. Thus, the verse says Hashem will bless those that bless Avraham. However, those that think to curse Avraham are not themselves cursed until they actually articulate their words. Hashem doesn’t consider improper thoughts as deeds. He only punishes actual transgressions. As such, the verse says those that curse Avraham will themselves be cursed.
 Based on Kli Yakar to Genesis 12:3
 Ibn Ezra ad. loc. notes that this verb is in the singular, whereas those that will bless Avraham is plural. See Chizkuni, and Tur HaAroch and Radak ad. loc., who all say that it’s because the amount of people who would curse Avraham is minimal.
 Genesis loc. cit.
 See also Ohr HaChaim ad. loc., who addresses this question
 הקב”ה טובה מצרף מחשבה למעשה (Kiddushin 40a)
 Ibid 39b. See the Chida’s Chomas Anach and Penei Dovid ad. loc. who asks on this that this rule is only said regarding Jews
 טרם יקראו ואני אענה (Isaiah 65:24)
 Proverbs 16:1
 Yevamos 64a
 The Kli Yakar doesn’t finish off this thought, but it’s clear where his intent was going. This is also how the Chomas Anach understood his intent