This is lengthy, but it’s very interesting. It’s a quote from Sefer HaBris by R’ Pinchas Horowitz of Vilna on the importance of learning a trade:
Also, such a person can be confident that he will not miss even a single day of his service of G-d, since his means of support is always at hand, and his sustenance is available in his dwelling and his own city. He will not lie down at night without having eaten, because a tradesman is never without sustenance, nor will he need to travel to faraway places in other lands to seek his sustenance. For when travelling, by necessity a person must be neglectful of the service of G-d, as is well known; there is no way to turn aside and focus on Torah and prayer with concentration when one is away from his place and has set out on the road.
[work and Torah learning]
[of Torah]
– Sefer HaBris 2:12:10 (2:13:2 in the DBS version)