How do I know that my prayer is sound and accepted?

The worshipper can be assured of the validity of their prayer by performing it completely, fulfilling its pillars, conditions, and obligations, along with humility and avoiding nullifiers. As for acceptance, its matter is with Allah Almighty. The servant must do what Allah has commanded them to do, have good thoughts of Him, and supplicate Him to accept it from them. Allah Almighty has informed us that He accepts from the pious and does not let the reward of the doers of good go to waste, as He says: "And never would Allah have caused your faith to be lost" (Al-Baqarah: 143).