One is ilm (knowledge) and the other is amal (action). In principles of science – we have theory and practical. Theory is the knowledge and practical is the application of the knowledge. So, in this way- yaqeen (conviction) will be of 3 types
- Ilm-ul-yaqeen (theory- taught in class)
- Ayn-ul-yaqeen (practical -seen in laboratories)
- Haq-ul-yaqeen (the combination of both of the above)
I always say with certitude that if you want to be a friend of Allah, study science. It will make you a 100% friend and a recognizer of Allah (SWT). But the condition is that first understand and recognize the greatness of Allah (SWT).