Learn good mannerisms
Imaam Maalik ibn Anas (رحمه الله تعالى) said to a youth from the Quraysh:
"Oh nephew, learn good mannerisms before you learn the knowledge."
(Taken from Al-Jaami' fee Ahkaam wa Aadaab As-Sibyaan/al-Hilyah 6/330)
Hasan al-Basri (d.110 A.H.) said:
‘Statements cannot be correct except with actions; Statements and actions cannot be correct except with an intention; and statements, actions and an intention cannot be correct except according to the Sunnah.’
[From ‘Sharh Usool I’tiqaad Ahl-us-Sunnah’ al –Laalkaee 2/57]