The embodied beings are unable to completely abstain from works. Therefore, one who renounces the fruit of work is considered a Tyaagi or renunciant. (18.11)
The sensual pleasures appear like nectar in the beginning, but become like poison in the end. The sensual pleasures wear out the vigor of the body and mind, and results in disease and suffering in the end. Such pleasures must be avoided. (18.38)
All beings originate from, and are pervaded by Brahman. Worshipping Him by performing one's duty for Him one attains nirvana.(18.46)
These are few beautiful verses from Bhagwad Gita. It talks about detachment from materialistic attachment even on our work. This is because in the truest sense when one submit complete to the Divine, the work one perform is performed for the Divine. Thus attachment to selfish work is discouraged here. This was the central theme of Gautama Buddha's teaching also as a way to cease dukkha or sufferings by being free of desire. We expect too much from our action. The best way is to perform the duty and just that. And the action or duty has to be performed in a state of mindfulness, with devotion. A central part of Buddha's teaching was how to attain this mindfulness.
In the Final Testament, Quran thus it is echoed, 'God loves those who are mindful of their duties'. Being the last Divine Message to humanity, submission has been the main theme for Islam and that brings harmony in a persons life. This submission means submission to Divine Laws and Nature as it is made by the Ultimate Soul. And this was the very ancient esoteric wisdom (theosophy) to know and understand the laws of Nature.