Ksatriya, he should be very brave, not to go away from fighting. He must have a ruling capacity. He must be charitable. In this way, ksatriya must execute his system of life

Expressions researched:
"Ksatriya, he should be very brave, not to go away from fighting"

Srimad-Bhagavatam Lectures

The brāhmaṇa must execute his system of life, satyaṁ śamo damas titikṣā ārjava, jñānaṁ vijñānam āstikyaṁ brahma-karma svabhāva-jam. A brāhmaṇa must execute all these principles of life. Similarly, kṣatriya, he should be very brave, not to go away from fighting. He must have a ruling capacity. He must be charitable. In this way, kṣatriya must execute his system of life.

Lecture on SB 1.2.8 -- Vrndavana, October 19, 1972:

So people, having no information of the spirit soul, they are interested in body and mind, and they have created some concocted religious system for benefit of the body and mind. So the varṇāśrama-dharma, beginning... Dharma begins from the varṇāśrama-dharma, which is now going on in the name of Hindu religion. Actually there is no such word "Hindu" in the Vedic literature. It is a concocted word given by the Muhammadans. Real Vedic system of religion is varṇa and āśrama. Four varṇas: brāhmaṇa, kṣatriya, vaiśya, śūdra; and four āśramas: brahmacārī, gṛhastha, vānaprastha, and sannyāsa. So one has to execute... The brāhmaṇa must execute his system of life, satyaṁ śamo damas titikṣā ārjava, jñānaṁ vijñānam āstikyaṁ brahma-karma svabhāva-jam (BG 18.42). A brāhmaṇa must execute all these principles of life. Similarly, kṣatriya, he should be very brave, not to go away from fighting. He must have a ruling capacity. He must be charitable. In this way, kṣatriya must execute his system of life. Similarly vaiśya, he must also execute his system of life: kṛṣi-gorakṣya-vāṇijyaṁ vaiśya-karma svabhāva-jam (Bg 18.44). Agriculture, cow protection. Nowadays, either brāhmaṇa or kṣatriya or vaiśya, practically everything is lost. Nobody is executing his occupational duties. Simply śūdra, without any knowledge, without any enlightenment. Try to get some money and fill up your belly and go on sleeping, that's all. This is śūdra-karma-svabhāva-jam. Paricaryātmakaṁ karma. Therefore śāstra says kalau śūdra-sambhavaḥ. In this age practically 99.9% population are śūdras, because they have given up, they have forgotten everything, what is the duty of brāhmaṇa, what is the duty of a kṣatriya, what is the duty of a vaiśya. Maybe some vaiśyas are there and śūdras are there.