In prayer you speak with your Lord

Whoever stands in prayer is in private conversation with Allah.

Narrated by Anas ibn Malik

When one of you is praying, he is in private conversation with his Lord.

Sahih al-Bukhari 531

What this hadith teaches

Remembering this at the takbir is the best help for focus: you are speaking to the King of kings.

Reference and grade

Grade
Sahih (in Sahih al-Bukhari)
Narrator
Anas ibn Malik

The hadith in Arabic نص الحديث

إِنَّ أَحَدَكُمْ إِذَا صَلَّى يُنَاجِي رَبَّهُ فَلاَ يَتْفِلَنَّ عَنْ يَمِينِهِ، وَلَكِنْ تَحْتَ قَدَمِهِ الْيُسْرَى

Arabic text of Sahih al-Bukhari 531, as given on sunnah.com.