The Prophet Muhammad (peace be and blessing of Allah be upon him) said: "If anyone travels on a road in search of knowledge, God will cause him to travel on one of the roads of Paradise. The angels will lower their wings in their great pleasure with one who seeks knowledge. The inhabitants of the heavens and the Earth and (even) the fish in the deep waters will ask forgiveness for the learned man. The superiority of the learned over the devout is like that of the moon, on the night when it is full, over the rest of the stars. The learned are the heirs of the Prophets, and the Prophets leave (no monetary inheritance), they leave only knowledge, and he who takes it takes an abundant portion. - Sunan of Abu-Dawood, Hadith 1631

Oh Uman, Knowledge is better then wealth.Knowledge will protect you while you have to protect your wealth. Knowledge is a ruler over other things while wealth is ruled over. Knowledge grows as you spread it while wealth decreases as you spend it." -Ali ibn Abi Talib advising a student.

The Etiquettes of Learning, Imam Shafi'i

اصبر على مر الجفا من معلم *** فإن رسوب العلم في نفراته

Be patient over the teacher’s strictness and harshness
For the stores of knowledge are present in his harshness

ومن لم يذق ذل التعلم ساعة *** تجرع ذل الجهل طول حياته
Whoever does not taste the humility of learning, even for an hour
Will drink the humility of ignorance for the rest of his life

ومن فاته التعليم وقت شبابه *** فكبر عليه أربعا لوفاته
For him who misses out on learning in his youth,
Then announce four takbirs over him for his death is due

حياة الفتى – والله – بالعلم والتقى *** إذا لم يكونا لا اعتبار لذاته
By Allah, the life of a youth is by knowledge and piety
If they are not present, then nothing can express his existence