بسم الله
قال ابن القيم رحمه الله: و أما الشرك في الاءرادات و النيات, فذلك البحر الّذي لا ساحل له, و قلّ من ينجو منه. فمن أراد بعمله غير وجه الله, و نوى شيئا غير التقرّب اليه و طلب الجزاء منه, فقد أشرك في نيته و ارادته.و هذه هي الحنيفية ملّة ابرهيم الّتي أمر الله بها عباده كلهم, و لا يقبل من أحد غيرها, و هي حقيقة الاءسلام,كما قال تعالى: وَمَن يَبْتَغِ غَيْرَ الإِسْلاَمِ دِينًا فَلَن يُقْبَلَ مِنْهُ وَهُوَ فِي الآخِرَةِ مِنَ الْخَاسِرِينَ3:85
(الجواب الكافي ص.115)
Imaam Ibnul Qayyim (rahimahullah) said: "And as for Shirk in Al-Iraadaat [desires] and in An-Niyyaat [intentions] then [verily] it is an ocean of which there are NO shores, and very few are successful [in not drowning in it] from it, and whoever desires with his actions [from his acts of worship] other than the Face of Allah and intends [by it] something other than seeking nearness to Him [Allah] and seeks a reward from it, then he has commited shirk in his niyyah [intention] and his Iraada[purpose], and Al-Ikhlaas [having sincerity in worship] is that one sincerely devotes his Af'aal [actions] and Aqwaal [statements] and his Iraadah[purpose] and his Niyyah [intention] and this is the religion of Ibraheem [alayhi salam] that which Allah commanded all His servants with, and nothing other than it [Al-Islaam] shall be accepted from anyone [except Islaam] Just as Allah says:
And whoever seeks a religion other than Islam, it will never be accepted of him, and in the Hereafter he will be one of the losers.
[3:85]
Remember Ikhwaatu wa Akhawaat very few people are saved from it "wa qalla man yanju minhu" very few people [are successful from falling into it] are free from it.
Al-Jawaabul Kaafee pg. 115