The Meaning of Reliance upon Allah

He says: I hope you will be kind enough to explain these meanings in detail so that a person can apply them practically in his life. Then he lists a number of meanings, the first of which is: Reliance upon Allah?
Answer: Reliance upon Allah means entrusting matters to Him and depending on Him, the Exalted. So, he leaves his house relying on Allah, he fasts relying on Allah, he prays relying on Allah, and he depends on Him in performing these matters, not on himself, nor on Zayd or 'Amr. Rather, he prays and relies on Allah that Allah will help him in performing it, and he fasts and relies on Allah that Allah will help him in performing the fast. He goes out to sell and buy, relying on Allah that Allah will benefit him through His means. He borrows and relies on Allah that Allah will help him in repaying the debt. He goes out for Hajj, relying on Allah that Allah will help him in performing Hajj. And so on, he seeks help from Allah in all his affairs and relies on Him (Exalted and Majestic is He), while doing the causes, while engaging in the causes that Allah has prescribed and commanded. Yes.
The presenter: While engaging in the causes?
The Shaykh: The causes are necessary.
The presenter: Allah is the Helper. May Allah reward you with good.